Geotemperature Evolution of the Ordovician Strata in the Tarim Basin and its Petroleum Geology Significance

2012 ◽  
Vol 622-623 ◽  
pp. 1638-1641
Author(s):  
Zong Lin Xiao ◽  
Qing Qing Hao ◽  
Zhong Min Shen
Keyword(s):  
Tarim Basin ◽  
Oil And Gas ◽  
Petroleum Exploration ◽  
Upper Ordovician ◽  
Tahe Oilfield ◽  
Oil Resources ◽  
Oil And Gas Resources ◽  
Steady State Heat ◽  
The One ◽  
Oil Cracking

The Tarim basin is an important petroleum basin in China, which produces a large amount of oil and gas resources. This paper calculates the geotemperature of the middle-upper Ordovician basal boundary during the main geological periods using the one-dimensional steady-state heat conduction equation. The simulation result reveals that from the late Ordovician to the present, the Manjiaer sag in the Tabei depression retains the highest temperature in the Tarim basin, and its highest temperature reaches 400°C in the present, while other areas in the Tarim basin have undergone relatively low temperature. Only in the Manjiaer sag of the Tabei depression and the Yecheng and Tanggubasi sags in the Southwest depression, the temperature exceeds 250°C, reaching the condition of liquid oil cracking into gas. Geotemperature of the middle-upper Ordovician basal boundary in the Tahe oilfield of the Central uplift is lower than 250 °C. It is thus inferred that there are abundant oil resources in the Ordovician strata of the Tahe oilfield. This study may provide effective geotemperature data for the next petroleum exploration in the Tarim basin.

scholarly journals Hydrocarbon Distribution Pattern in the Upper Ordovician Carbonate Reservoirs and its Main Controlling Factors in the West Part of Northern Slope of Central Tarim Basin, NW China

2012 ◽  
Vol 30 (5) ◽  
pp. 775-792 ◽  
Author(s):  
Xiuxiang Lü ◽  
Jianfa Han ◽  
Xiang Wang ◽  
Weiwei Jiao ◽  
Hongfeng Yu ◽  
...  
Keyword(s):  
Physical Properties ◽  
Distribution Pattern ◽  
Tarim Basin ◽  
Oil And Gas ◽  
Petroleum Exploration ◽  
Chemical Compositions ◽  
Northern Slope ◽  
Upper Ordovician ◽  
The West ◽  
West Part

The northern slope of Tazhong palaeo-uplift has become a key target field for petroleum exploration in Tarim Basin. A major breakthrough is made in the Upper Ordovician oil and gas exploration in the west part of northern slope. Oil and gas near the Tazhong I slope-break zone occurred in Liang2 section was dominated by condensate gas reservoir, while oil reservoir was mainly inward distributed in Liang3 section. The crude oils in this region in physical properties characterized by low density, low viscosity, low freezing point, low sulfur content, medium wax content. And the natural gas in chemical components was featured by low-medium nitrogen content, low-medium carbon dioxide content and medium-high hydrogen sulfide content. In the plane direction, oil and gas exhibited a “oil in the interior, gas in the exterior” distribution pattern, and mainly located in a depth range of 0∼60 m below the top of the Liang3 section in the longitudinal direction. The distribution patterns displayed in physical properties and chemical compositions of oil and gas are controlled by multiple influencing factors. The results of above comprehensive studies suggested that vertical overriding of reef-bank-type reservoirs in Liang2 section and karst reservoirs in Liang3 section provided superior reservoir conditions; faults and fractures not only formed reservoir space and improved reservoir quality, also promoted the development of karst reservoirs and provided good migration pathway for hydrocarbon accumulation; one of the nonnegligible factors leading to this kind of distribution pattern for the Upper Ordovician oil and gas reservoirs is shale content in the compact carbonate formation; multi-sources and multi-stages of hydrocarbon filling are absolutely necessary controlling factor for this kind of distribution pattern in the whole block.

scholarly journals Multiphase Calcite Cementation and Fluids Evolution of a Deeply Buried Carbonate Reservoir in the Upper Ordovician Lianglitag Formation, Tahe Oilfield, Tarim Basin, NW China

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-19 ◽  
Author(s):  
Jiaqing Liu ◽  
Zhong Li ◽  
Lijuan Cheng ◽  
Jiawei Li
Keyword(s):  
Fluid Inclusion ◽  
Tarim Basin ◽  
Meteoric Water ◽  
Oil And Gas ◽  
Isotope Analysis ◽  
Carbonate Reservoir ◽  
Upper Ordovician ◽  
Nw China ◽  
Tahe Oilfield ◽  
Homogenization Temperatures

Oil and gas have been found in the Upper Ordovician Lianglitag Formation carbonates in the Tahe Oilfield, Tarim Basin, NW China. This study documents the origin of diagenetic fluids by using a combination of petrology, SIMS, fluid inclusion, and radiogenic isotope analysis. Six stages of calcite cements were revealed. C1-C2 formed in marine to early burial environments. C3 has relatively low δ18OVPDB values (−8.45‰ to −6.50‰) and likely has a meteoric origin. Meteoric water probably fluxed into aquifers during the Early Paleozoic and Late Paleozoic uplift. C4 has δ18OVPDB values typically 3‰ higher than those of C3, and probably formed during shallow burial. C5 displays relatively negative δ18OVPDB values (−8.26‰ to −5.12‰), and the moderate-to-high fluid-inclusion temperatures imply that it precipitated in burial environments. C6 shows homogenization temperatures (up to 200°C) higher than the maximum burial and much lower salinities (<10.61 wt% NaCl), which may suggest that the fluid was deeply recycled meteoric water. The average 87Sr/86Sr ratios of fracture- and vug-filling calcite cements are much higher, indicative of incorporation of radiogenic Sr. Caves and fractures constitute the dominant reservoir spaces. A corresponding diagenesis-related reservoir evolution model was established that favors exploration and prediction.

Seismic attribute for characterization and prediction of carbonate faulted karst reservoirs in Tarim Basin, China

2021 ◽  
pp. 1-36
Author(s):  
Zhiwei Xiao ◽  
Li Wang ◽  
Ruizhao Yang ◽  
Dewei Li ◽  
Lingbin Meng
Keyword(s):  
Tarim Basin ◽  
Oil And Gas ◽  
Prediction Method ◽  
Strike Slip ◽  
Fault System ◽  
Bright Spot ◽  
Upper Ordovician ◽  
Reservoir Prediction ◽  
Seismic Attribute ◽  
Gas Field

An ultradeep, faulted karst reservoir of Ordovician carbonate was discovered in the Shunbei area of the Tarim Basin. Fractured-cavity reservoirs buried beneath the large thickness of upper Ordovician mudstone were formed along the fault-karst belts. The hydrocarbon accumulation in these reservoirs is controlled by the fault system, and the oil-gas accumulation was affected by karstification and hydrothermal reformation. Previous studies and 2D modeling revealed that the reservoirs had “bright spot” amplitude responses like “string beads,” and they have developed along the strike-slip faults. However, describing such a complex fault-controlled karst system is still a difficult problem that has not been well addressed. We have sought to instruct the attribute expression of faulted karst reservoirs in the northern part of the Tarim Basin. We applied coherence and fault likelihood (FL) seismic attributes to image faults and fractures zones. We then used a trend analysis method to calculate the residual impedance from the impedance of the acoustic inversion, using the fact that residual impedance has higher lateral resolution in reservoir predictions. Finally, we integrated the coherence, FL, and residual impedance attributes into a new seismic attribute, the “fault-vuggy body,” with a certain fusion coefficient. The fault-vuggy body attribute establishes a connection between faults and karst cavities. This method could help in the characterization and prediction of carbonate faulted karst reservoirs. Available drilling data were used to validate that the fused fault-vuggy body attribute was an effective reservoir prediction method. As the seismic sections and slices along the layer help delineate, the distribution of bright spots and strike-slip faults indicates that the main strike-slip fault zones are the most favorable reservoirs in the Shunbei Oil and Gas Field.

Dealing with Territorial Cleavages in Constitutional Transitions in Iraq

2019 ◽  
pp. 99-118
Author(s):  
Zaid Al-Ali
Keyword(s):  
Oil And Gas ◽  
Traditional Form ◽  
Political Crises ◽  
Oil And Gas Resources ◽  
The One

This chapter examines why constitutional transition has failed to resolve Iraq’s territorial cleavages, especially the one between Arabs and Kurds. It first provides the context that led to the Constitution drafting process and the establishment of Iraq’s first federal arrangement that saw the merger of provinces to form larger regions. In particular, it considers a range of contentious issues that arose during the constitutional negotiations, not least of which was the ownership and management of oil and gas resources. Furthermore, the push for a more traditional form of federalism left minority views (generally those of the Kurdish negotiators) unrepresented. The chapter also analyzes the outcomes of Iraq’s constitutional transition, including the deterioration of the Kurdistan Region’s economic and political crises, before concluding with an overview of the key lessons that can be drawn from the process.

scholarly journals ANALYSIS OF OPEX, OIL LIFTING AND INDONESIA CRUDE PRICE IN AFFECTING CONTRACTOR’S NET SHARE ON AN OIL AND GAS COMPANY IN INDONESIA

2013 ◽  
Vol 5 (2) ◽  
pp. 197-223
Author(s):  
Endah Widiastuti ◽  
Rudy Kurniawan
Keyword(s):  
Oil And Gas ◽  
Action Plan ◽  
Oil And Gas Industry ◽  
Petroleum Exploration ◽  
Gas Industry ◽  
Operating Expenditure ◽  
Contractual Arrangements ◽  
Production Sharing ◽  
Global Issue ◽  
Oil And Gas Resources

Oil and gas industry is an international scale of business which is very affected with the global issue and situation. Indonesia is a country that known for its wealth of natural resources especially in oil and gas resources. Production-Sharing Contract is the form cooperation types of contractual arrangements for petroleum exploration and development in Indonesia. With current oil and gas business situation, where oil prices are fluctuative, oil lifting is decreased, operating expenditure of a company tends to increase. The trend of contractor’s net shares on this oil and gas company in Indonesia is fluctuative, it seems very unpredictable pattern. If its continuing, it can obstruct the company’s sustainability and growth. In order to know the significance factor and  to optimize the contractors net share of this unpredictable pattern during time limitation to the end of contract then it raises the need to quantify, model and know the significant factors that is affecting the performance of Production Sharing Contract’s net share. Thus can be done based on historical financial data report. The data obtained is used to measure the relationship of independent variables such as operating expenditure, oil lifting and Indonesia crude price to the dependent variable: contractor’s net share in order having a base of decision making to determine the action plan for the PSC by using multiple regressions as its methods. The result showed that oil liftings and Indonesia crude price significantly affect the contractor’s net share.

Lowering the cost of funds for exploration: the case for tax-based equity financing incentives

2020 ◽  
Vol 60 (2) ◽  
pp. 569
Author(s):  
Kenneth Wee
Keyword(s):  
Oil And Gas ◽  
Petroleum Industry ◽  
Equity Capital ◽  
Petroleum Exploration ◽  
Security Requirements ◽  
Equity Financing ◽  
Return On Capital ◽  
Oil And Gas Resources ◽  
The Cost ◽  
Taxation System

Exploring for, and discovering, new oil and gas resources is essential to an oil and gas company’s ability to replenish and enhance its reserves base. With rising future demand for clean, sustainable and affordable energy sources and the important role and contribution of the Australian petroleum industry in the evolving global energy mix, continual investment in exploration activity will be the key to unlocking the prospectivity of undeveloped acreage, particularly in frontier areas. However, exploration is inherently risky and costly. Companies constantly compete for scarce capital to provide the necessary funding to undertake exploration activities. Financial capacity underwrites the ability to bid for exploration acreage by offering commensurate work program commitments. For junior explorers in the early exploration stage, liquidity constraints can mean that the covenants, collateral security requirements and periodic servicing obligations associated with raising debt financing are prohibitive. Equity investors, on the other hand, typically demand a higher return on capital. A fresh policy approach to encouraging petroleum exploration in Australia should be considered by government to incentivise the providers of equity capital to risk money for exploration ventures. This paper considers three models that are used internationally: (1) flow-through shares, (2) worthless stock deductions and (3) notional interest deductions for equity financing. This paper provides a comparative in-principle analysis of each model and offers some suggestions on how these models may be adapted to an Australian context and embedded into the existing taxation system.

scholarly journals Mackenzie-Peel Platform and Ellesmerian Foreland Composite Tectono-Sedimentary Element, northwestern Canada

2021 ◽  
pp. M57-2016-5
Author(s):  
Karen M. Fallas ◽  
Robert B. MacNaughton ◽  
Peter K. Hannigan ◽  
Bernard C. MacLean
Keyword(s):  
Oil And Gas ◽  
Early Carboniferous ◽  
Oil Field ◽  
Passive Margin ◽  
Petroleum Exploration ◽  
Rock Formations ◽  
Devonian Shale ◽  
History Of ◽  
The One ◽  
Uplift And Erosion

AbstractThe Mackenzie-Peel Platform tectono-sedimentary element, and the overlying Ellesmerian Foreland tectono-sedimentary element, consist of Cambrian to Early Carboniferous shelf and slope sedimentary deposits in Canada&s northern Interior Plains. In this chapter, these elements are combined into the Mackenzie-Ellesmerian Composite Tectono-Sedimentary Element. The history of the area includes early extensional faulting and subsidence in the Mackenzie Trough, passive margin deposition across the Mackenzie-Peel Platform, local uplift and erosion along the Keele Arch, subsidence and deposition in the Ellesmerian Foreland, possible minor folding during the Ellesmerian Orogeny, and folding and faulting in Cretaceous to Eocene time associated with the development of the Canadian Cordillera. Recorded petroleum discoveries are within Cambrian sandstone (Mount Clark Formation), Devonian carbonate strata (Ramparts and Fort Norman formations), and Devonian shale (Canol Formation). Additional oil and gas shows are documented from Cambrian to Silurian carbonate units (Franklin Mountain and Mount Kindle formations), Devonian carbonate units (Arnica, Landry, and Bear Rock formations), and Late Devonian to Early Carboniferous siliciclastic units (Imperial and Tuttle Formations). Petroleum exploration activity within the area has occurred in several phases since 1920, most of it associated with the one producing oil field at Norman Wells.

scholarly journals Techno-Economic Evaluation of Exploration & Production

2013 ◽  
Vol 9 (2) ◽  
Author(s):  
Sumeet Gupta ◽  
Manvinder Singh Pahwa
Keyword(s):  
Economic Evaluation ◽  
Financial Distress ◽  
Net Present Value ◽  
Oil And Gas ◽  
Evaluation Process ◽  
Petroleum Exploration ◽  
Analysis Decision Tree ◽  
Oil And Gas Resources ◽  
Report Analysis ◽  
Fair Market Value

ABSTRACTOil and gas producing industry, which is extractive in nature, involves activities related to acquisition of minerals interests in properties, exploration, development and production of oil and gas. Oil and gas companies consist of many types of activities before it starts its operation in the field. It involves bidding procedure, acquiring mining lease, petroleum exploration license (PEL).  It consists of high risk and uncertainties which may cause financial distress for a company. The aforesaid activities are collectively referred to an upstream operation and form the ‘Upstream Petroleum industry’.   The industry is commonly referred to as the E&P industry.In order to assure the receipt of fair market value for oil and gas asset economic evaluation is performed. Economic evaluation consists of the assessment of oil and gas resources the valuation of resources in the market and the use of evaluation in considering the bid, exchange offer or other action. Full development of all three components of economic evaluation is essential if it is to be successful evaluation. Evaluation process embraces a range of procedures which, when applied to available data leads to an estimation of the right’s and property’s value. So to quantify the risk and uncertainties a good economic evaluation process is needed. There are many economic evaluation processes. Among the existing economic evaluation processes, which one is the best, is the main motto of our study.The study discusses different method of economic evaluation like Internal Rate of Return (IRR), Net Present Value (NPV), discounted payback period, etc. This report also consist some example on various methods. These methods does not account for risk and uncertainties. A trivial change in predictions alters the whole calculation of profit and loss and may compel the company to be great loser. Now to analyze the risk and uncertainties, Risk analysis is necessary. In this report we have included Sensitive analysis, Decision Tree and Monte Carlo simulation. At the end of the report analysis is broadly given in support of the best method of economic.                                               Key Words: Simulation, Economic Evaluation, Sensitive 

Application of UDM-2 Drilling Fluid Technology in the Development of Upper-Deep Oil and Gas Resources in Tarim Basin

2015 ◽  
Author(s):  
Jinzhi Zhu ◽  
Long Li ◽  
Lei Li ◽  
Zhen Zhang ◽  
Rongchao Cheng ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Oil And Gas Resources
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