95/03478 Quantitative analysis of coal type gas and oil type gas in the mixed gas reservoir in the northwest boarder of Junggar basin

1995 ◽  
Vol 36 (4) ◽  
pp. 254
Keyword(s):  
Quantitative Analysis ◽  
Junggar Basin ◽  
Mixed Gas ◽  
Gas Reservoir ◽  
Oil Type ◽  
Coal Type

scholarly journals Geochemical Characteristics of Natural Gas and Hydrocarbon Charge History in the Western Qaidam Basin, Northwest China

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Kefei Chen ◽  
Shixin Zhou ◽  
Jing Li ◽  
Chen Zhang ◽  
Zexiang Sun ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Vitrinite Reflectance ◽  
Empirical Relationship ◽  
Northwest China ◽  
Mixed Gas ◽  
Average Value ◽  
Carbon Isotopic ◽  
Western Qaidam Basin ◽  
Oil Type ◽  
Coal Type

31 natural gases in the western Qaidam Basin of China were collected and analyzed for gas composition including light hydrocarbons (C5-C7) and carbon isotopic characteristics. Based on genetic type obtained from C1-C3 and C7 fractions, four types of gases are identified: oil-type gas, coal-type gas, biodegraded gas, and mixed gas. The oil-type gas is the predominant-type gas in the western Qaidam Basin; coal-type gas is mainly distributed in the Zhahaquan and Nanyishan fields; mixed gas is mainly in the Zhahaquan, Wunan, and Nanyishan fields; and biodegraded gas is mainly distributed in the Huatugou and Yuejinerhao fields. According to the empirical relationship between δ13C1 and the equivalent vitrinite reflectance (Ro, %) of source rock, the Ro values of gas range from 0.6% to 1.5%, with an average value of 0.9%. The generation temperatures of major reservoired hydrocarbons (GTMRH) calculated from the C7 components range from 115.6°C to 141.7°C, with an average value of 126.5°C. These two maturity indicators have relatively positive correlation and reveal that the maturity of gas increases from west to east in the southwestern Qaidam Basin. Moreover, combining GTMRH with the homogenous temperature of petroleum inclusions, it is inferred that major petroleum charge in the western Qaidam Basin mainly occurred during the late period of the Himalayan movement. Deep hydrocarbon fluid sources were found in the Shizigou, Yingdong, Zhahaquan, and Nanyishan fields; thus, the deep reservoirs of paleouplifts adjacent to the hydrocarbon-generating depressions are estimated as a favorable area for further exploration in the western Qaidam Basin.

Seismic Qualitative and Quantitative Analysis for Reservoir Characterization of Globigerina BH Gas Field, North East Java Basin.

2021 ◽  
Author(s):  
I. Sumantri
Keyword(s):  
Quantitative Analysis ◽  
Seismic Data ◽  
Quantitative Methods ◽  
Reservoir Characterization ◽  
Seismic Analysis ◽  
Analysis Model ◽  
Gas Reservoir ◽  
Qualitative And Quantitative ◽  
North East ◽  
Exploration Well

BH field is one of the Globigerina limestone gas reservoir that exhibits strong seismic direct hydrocarbon indicator (DHI). This field is a 4-way dip faulted closure with Globigerina limestone as the main reservoir objective. The field was discovered back in 2011 by BH-1 exploration well and successfully penetrated about 350ft gross gas pay. BH-1 well was plugged and abandoned as Pliocene Globigerina limestone Mundu-Selorejo sequence gas discoveries. The laboratory analysis of sampled gas consists of 97.8% of CH4 and indicating a biogenic type of gas. This is the only exploration well drilled in this field and located on the crest of the structure. Seismic analysis both qualitative and quantitative, are common tools in delineating and characterizing reservoir. These methods usually make use of seismic data and well log collaboratively in the quest to reveal reservoir features internally. The lack of appraisal well in the area of study made the reservoir characterization process must be carried out thoroughly, incorporating several seismic datasets, both PSTM and PSDM, seismic gathers and stacks. Bounded by appraisal well limitation, this research looks into Gassmann's fluid substitution modeling, seismic forward modeling to confirm the DHI flat spot presence in the seismic, as well as seismic AVO analysis. Meanwhile, for quantitative analysis, model-based seismic post-stack inversion and simultaneous seismic pre-stack inversion were conducted in order to delineate the distribution of Globigerina limestone gas reservoir in BH Field. Through comprehensive analyses of qualitative and quantitative methods, this research may answer the challenge on how to intensively utilize seismic data to compensate the lack of appraisal well data in order to keep delivering a proper subsurface reservoir delineation.

Improvement of DOAS Technology in the Application of Mixed Gas Quantitative Analysis

2013 ◽  
Vol 753-755 ◽  
pp. 2265-2268
Author(s):  
Xue Gang Li ◽  
Xiu Ling Lv ◽  
Yi Zhang
Keyword(s):  
Absorption Spectrum ◽  
Quantitative Analysis ◽  
Least Square ◽  
Gas Absorption ◽  
Practical Significance ◽  
Support Vector ◽  
Analysis Model ◽  
Mixed Gas ◽  
Searching Ability ◽  
Difference Absorption

According to difference absorption spectrum mixed gas absorption spectrum in technology overlapping problem, a DOAS technology based on the PSO and LS-SVM fusion method was proposed. First, SO2, NO respectively to construct a quantitative analysis model by LS-SVM, And then, using PSO is strong optimization ability of least square support vector machine (SVM) the optimization of the parameters of the algorithm, and then, LS-SVMs parameter are optimized with PSO of the powerful searching ability, Finally, rebuilt the quantitative analysis model. Experiments show that using the improved DOAS method is feasible in solving the mixed gas spectrum overlap problem which has certain practical significance.

An Approach and Case Study on Determination of the Sulfur Deposition Radius in High Sulfur Gas Reservoir

2014 ◽  
Vol 1073-1076 ◽  
pp. 592-596
Author(s):  
Pei Luo ◽  
Yu Ming Luo ◽  
Kai Ma ◽  
Biao Zhang ◽  
Sha Sha Song
Keyword(s):  
Sulfur Deposition ◽  
Mixed Gas ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Well ◽  
Pressure Transient ◽  
Field Development ◽  
Eastern Sichuan Basin

In the process of high sulfur gas field development, the sulfur will separate out from the mixed gas when the pressure near wellbore area drops to a critical pressure of H2S. This will reduce the reservoir porosity greatly and decrease the gas well productivity as well. This paper discusses the characteristics of pressure transient testing plots when sulfur deposition occurs based on the redial composite reservoir model. And introduce an approach to determine the sulfur deposition radius near the wellbore with pressure transient testing interpretation in high sulfur gas reservoir. The method has been applied in some high sulfur gas field in eastern Sichuan Basin. The result shows that the method is simple and practical.

scholarly journals Genetic Types and Source of the Upper Paleozoic Tight Gas in the Hangjinqi Area, Northern Ordos Basin, China

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Xiaoqi Wu ◽  
Chunhua Ni ◽  
Quanyou Liu ◽  
Guangxiang Liu ◽  
Jianhui Zhu ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Source Rocks ◽  
Lower Permian ◽  
Tight Gas ◽  
Upper Paleozoic ◽  
A Minor ◽  
Gas Component ◽  
Oil Type ◽  
Coal Type

The molecular and stable isotopic compositions of the Upper Paleozoic tight gas in the Hangjinqi area in northern Ordos Basin were investigated to study the geochemical characteristics. The tight gas is mainly wet with the dryness coefficient (C1/C1–5) of 0.853–0.951, andδ13C1andδ2H-C1values are ranging from-36.2‰to-32.0‰and from-199‰to-174‰, respectively, with generally positive carbon and hydrogen isotopic series. Identification of gas origin indicates that tight gas is mainly coal-type gas, and it has been affected by mixing of oil-type gas in the wells from the Shilijiahan and Gongkahan zones adjacent to the Wulanjilinmiao and Borjianghaizi faults. Gas-source correlation indicates that coal-type gas in the Shiguhao zone displays distal-source accumulation. It was mainly derived from the coal-measure source rocks in the Upper Carboniferous Taiyuan Formation (C3t) and Lower Permian Shanxi Formation (P1s), probably with a minor contribution from P1s coal measures from in situ Shiguhao zone. Natural gas in the Shilijiahan and Gongkahan zones mainly displays near-source accumulation. The coal-type gas component was derived from in situ C3t-P1s source rocks, whereas the oil-type gas component might be derived from the carbonate rocks in the Lower Ordovician Majiagou Formation (O1m).

Sign in / Sign up

Export Citation Format

Share Document