Integrating Horizontal Wells in 3D Geological Model Using Sequence Stratigraphic Framework in Braided Channel Complex of the Changbei Gas Field, Ordos Basin, China

The Milk River Transboundary Aquifer (Canada–USA) has been so intensively used over the 20th century that concerns have risen about the durability of this resource since the mid-1950s. This aquifer actually corresponds to the middle Virgelle Member of the Upper Cretaceous Milk River Formation (called Eagle Formation in Montana). To assess the conditions needed for a sustainable use of the aquifer, a comprehensive and unified portrait of the aquifer is needed across its international boundary. The stratigraphic framework and geometry of geological units on both sides of the international border were thus unified in a 50 000 km2 three-dimensional (3D) geological model. The Virgelle Member is 0–60 m thick and it subcrops near the border and along both sides of the Sweetgrass Arch. It dips away from the subcrop areas in a semi-radial pattern. The Medicine Hat gas field hosted by the Alderson Member (Alberta), which is separated from the other members by a regional unconformity, and the Tiger Ridge gas field near the Bears Paw Mountains (Montana) limit the extent of the aquifer. The unified 3D geological model forms the necessary basis for conceptual and numerical hydrogeological models of the Milk River Aquifer.

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Quantitative Identification of Reservoir Fracture with the Variable Scale Fractal Technique in Su53 Gas Field, Ordos Basin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.1723 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 1723-1726

Author(s):

Hua Wen

Keyword(s):

Fractal Dimension ◽

Ordos Basin ◽

Horizontal Wells ◽

Gas Field ◽

Gas Well ◽

Response Characteristics ◽

Vertical Heterogeneity ◽

Fracture Development ◽

Single Well ◽

The Relationship

Typical tight gas reservoirs in the Su53 Gas Field, Ordos Basin, are the demonstration region for deploying horizontal wells. In order to provide foundation for evaluating the volume fracturing adaptability of horizontal wells, through using the amplitude difference data between deep investigate double lateral resistivity (Rd) and shallow investigate double lateral resistivity (Rs), and other conventional logging data, in combination with the response characteristics of fracture in the logging curve, reservoir fracture was quantitatively identified with the variable scale fractal technique, the vertical heterogeneity of fracture distribution was analyzed, and the relationship between fractal dimension value of fracture and initial deliverability of gas well was researched. The results indicate that, this method is applied to quantitatively identify and evaluate the fracture development degree of single-well is feasible; the relationship between fractal dimension value and fracture development degree is positively relative, fractal dimension value is bigger, the fracture is more developed; there is a good corresponding relationship between fractal dimension value and deliverability of gas well, fractal dimension value decreases with a decrease of deliverability.

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Sequence stratigraphic analysis of the Surma Group in X Gas Field, Surma Basin, Bengal Delta

Journal of Nepal Geological Society ◽

10.3126/jngs.v58i0.24572 ◽

2019 ◽

Vol 58 ◽

pp. 39-52

Author(s):

Afroza Parvin ◽

A. S. M. Woobaidullah ◽

Md Jamilur Rahman

Keyword(s):

Tidal Flat ◽

Transgressive System Tract ◽

Gas Field ◽

Depositional Sequences ◽

Sequence Stratigraphic ◽

Bengal Delta ◽

Stratigraphic Framework ◽

Facies Associations ◽

Surma Group ◽

System Tract

This study builds a high-resolution sequence stratigraphic framework for the Surma Group in the X Gas field. At first, electrofacies and depositional sequences were interpreted from wire line logs. Then, the field wide configurations of these sequences have been identified in seismic using reflection terminations (of flap, onlap, top lap and down lap relationship). Finally, wire line log and seismic interpretations were integrated to establish sequences stratigraphic framework in the Surma Group. Electrofacies analysis has revealed four major facies associations namely: (i) Bell shaped fining upward facies corresponds to retrogradational shoreface to tidal flat deposits, (ii) Funnel shaped coarsening upward facies corresponds to progradational shoreface to tidal flat, (iii) Cylindrical aggradational facies interpreted as stacked channel and (iv) Symmetrical or Bow shaped facies corresponds to heterolithic unit. The succession of Surma group of about 3100+ m has been divided into twelve depositional sequences. With exception of depositional sequence 1, 11 and 12, most of them are composed of three system tracts: sandy lowstand system tract, shaley transgressive system tract and heterolithic to shaley highstand system tract. Repetitive occurrence of incised valley, shoreface sand as well as tidal channel sand separated by transgressive system tract shelfal mud resulted in sand-shale alternation in the Surma Group. The lower depositional sequences (up to sequence-6) are shale dominated and equivalent to the Lower Surma Group. The upper six sequences are sand dominated, have more channel incisions and sequence boundary representing the Upper Surma Group

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Sequence stratigraphic analysis and integrated 3D geological modeling of M1 block, Wenmingzhai oilfield, Dongpu depression, China

Open Geosciences ◽

10.2478/s13533-012-0138-3 ◽

2013 ◽

Vol 5 (3) ◽

Cited By ~ 2

Author(s):

Xue Li ◽

Jinliang Zhang ◽

Yong Yuan ◽

Cunlei Li ◽

Ningning Meng

Keyword(s):

High Resolution ◽

Stratigraphic Correlation ◽

Geological Model ◽

Geological Modeling ◽

Reservoir Properties ◽

3D Geological Modeling ◽

Sequence Stratigraphic ◽

Work Related ◽

3D Geological Model ◽

Geological Research

AbstractThe M1 block is a typically complex fault-block oilfield, whose recovery has reached 30.5% through the twenty years waterflooding development. Remaining oil scatters very widely and the production between layers is in a high degree. However, many problems have been exposed at the same time which hinder improvement of the recovery rate and sustainable development of the reservoir. Hence, it is important to carry out basic geological research and form a comprehensive understanding of reservoir properties. However, few such studies have been conducted in China. In this study, work related to basic geological research was conducted based on high-resolution sequence stratigraphy, seismic interpretation technology and 3D visual geological modeling, and significant results were achieved. Three sequence orders and three types of interfacies in the stratigraphic architecture of M1 block were identified through seismic sections, logging curve characteristics and entropy spectrum analysis. Thirty-two short-term sequence cycles (fifth order), eight mid-term sequence cycles (fourth order) and two long-term sequence cycles (third order) were identified, followed by the establishment of a high-resolution isochronous stratigraphic correlation framework. Finally, a regional 3D geological model was established on the basis of these preliminary studies. The integrated 3D geological model is a valuable tool for reflecting geological bodies accurately, and it can accurately represent and describe reservoir heterogeneity.

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Fracturing Parameters Optimizing Simulation of Horizontal Well In WeiYuan Shale Gasfield

Journal of Physics Conference Series ◽

10.1088/1742-6596/2076/1/012001 ◽

2021 ◽

Vol 2076 (1) ◽

pp. 012001

Author(s):

Mingguang Che ◽

Meng Wang ◽

Bo Zeng ◽

Yi Song ◽

Wei Jiang ◽

...

Keyword(s):

Shale Gas ◽

Horizontal Well ◽

Horizontal Wells ◽

Fluid Volume ◽

Parameters Optimization ◽

Geological Model ◽

Gas Field ◽

Number Of Clusters ◽

Pumping Rate ◽

Lateral Length

Abstract Multistage fracturing and multi-clusters with long lateral fracturing were applied during developing the WeiYuan shale gas field, and the fracturing parameters were variable obviously for the fracturing lateral, perforating clusters, pumping rate, fracturing fluid volume and proppant quality. In this paper, the 3D geological model of a WeiYuan shale gas pad was used to simulate and optimize the fracturing parameters of the shale gas horizontal wells. The simulating results show that there is a reasonable matching relationship between different fracturing lateral length and the perforating clusters, and there is an optimal fluid volume and proppant quality. As the length of the fracturing lateral and the number of clusters increase, the spacing of horizontal wells need to be reduced reasonably. With the purpose of fracturing parameters optimization for WeiYuan shale gas horizontal wells, it is recommended to increase the number of perforation clusters, increase the treating rate, and use the reasonable fluid volume and proppant quality for different fracturing lateral. The research results of this paper have guiding significance for the optimization and treatment of fracturing shale gas horizontal well.

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