The Distribution Rules of Gas in Shan 2 Member in Yulin Area of Changqing Gas Field

2014 ◽  
Vol 962-965 ◽  
pp. 506-511
Author(s):  
Jing Chao
Keyword(s):  
Ordos Basin ◽  
Gas Production ◽  
Delta Front ◽  
Quartz Content ◽  
Gas Field ◽  
Good Relationship ◽  
Distribution Rules ◽  
Exploration And Production ◽  
Mouth Bar ◽  
Favorable Conditions

Yulin area of Changqing gas field in Ordos basin has the favorable conditions for gas accumulation in Shan 2 Member, which is the main productive layer to increase reserve and production. Based on the research of gas pool forming conditions, the distribution rules of gas in Shan 2 Member in Yulin area of Changqing gas field can be concluded: coals, swap dark mudstones and delta front sandbodies are well-developed vertically, the conditions of reservoir-forming combination for self-generation and self-preservation are processed; the sandbodies developed in submerged distributary channel and mouth bar microfacies of delta front have a high content of quartz, which have a good physical properties and a high gas production. There is a good relationship between the distribution of gas pools and the maturity of sandstone, the value 6 of maturity index (86% quartz content) can be used to delineate the zones of gas enrichment and productivity. This rule can guide the exploration and production of this area in next step.

Nanopore Structure Distribution of the Upper Paleozoic Tight Sandstones and Its Controls on Gas Production Performance in the Shenfu Area, Northeastern Ordos Basin, China

2021 ◽  
Vol 21 (1) ◽  
pp. 98-107
Author(s):  
Peng Wu ◽  
Jianguang Wu ◽  
Weikai Xu ◽  
Jimei Deng ◽  
Yiwen Ju
Keyword(s):  
Ordos Basin ◽  
Effective Porosity ◽  
Gas Production ◽  
Production Performance ◽  
Burial Depth ◽  
Tight Sandstone ◽  
Quartz Content ◽  
Upper Paleozoic ◽  
Interstitial Material ◽  
Sandstone Reservoirs

Based on X-ray diffraction, thin section and scanning electron microscopy observation, helium porosity and permeability tests and high-pressure mercury intrusion experiments, the pore and throat distributions of tight sandstone reservoirs were revealed on a nm–μm scale, and their control on gas productivity in the Shenfu area, northeastern Ordos Basin, China was discussed. The results show that lithic sandstones are the main rock types. As the burial depth increases, the quartz content increases, while the feldspar content decreases. There is approximately 5–25% of interstitial material varying between the different layers, and this interstitial material is mainly composed of mud, kaolinite and Fe-calcite. These tight sandstone reservoirs generally have porosities <10% and permeabilities <1 mD. Except for the Shiqianfeng Formation, the dissolution pores in other Upper Paleozoic strata all account for more than 80% of pores. The main pore types are mainly intragranular dissolution pores, intergranular dissolution pores and cement dissolution pores. Generally, the pore radius is approximately 500 nm, while the pore throats are much smaller are variable in size. Wells with high amounts of sandstones but low gas production rate are generally characterized by dominant intercrystalline pores, few macropores, and low effective porosity. The lithology and reservoir characteristics, which are controlled by primary deposition and secondary diagenesis, are speculated to be main factors controlling the gas contents.

3D seismic attributes for a tight gas sand reservoir characterization of the eastern Sulige gas field, Ordos Basin, China

Geophysics ◽  
2015 ◽  
Vol 80 (2) ◽  
pp. B35-B43 ◽  
Author(s):  
Zhiguo Wang ◽  
Jinghuai Gao ◽  
Daxing Wang ◽  
Qiansheng Wei
Keyword(s):  
Ordos Basin ◽  
Seismic Attributes ◽  
Gas Production ◽  
Seismic Attenuation ◽  
Tight Gas ◽  
3D Seismic ◽  
Seismic Attribute ◽  
Gas Field ◽  
Attribute Analysis ◽  
Phase Tuning

The Lower Permian Xiashihezi Formation of the Ordos Basin is the largest producer of tight gas sand in China. The controls on tight gas production are many and include a variety of geologic, hydrodynamic, and engineering factors from one well to another throughout the basin. In this study, we considered data from a [Formula: see text] 3D seismic volume and logs from 17 wells to investigate the geologic controls on gas production in the [Formula: see text] member of the Xiashihezi Formation, eastern Sulige gas field, Ordos Basin. Our objective was to determine the potential of applying multiple seismic attributes to identify the higher productivity areas of a tight gas sand reservoir. To achieve this, we used amplitude, complex traces, spectral decomposition, and seismic attenuation attributes derived from the 3D seismic volume to detect gas-bearing sand areas. The results of seismic attribute analysis revealed that no single attribute is correlated to higher productivity areas. The qualitative correlations between attributes and production records reflected that higher productivity areas are associated with seismically definable higher amplitude, more stable phase, tuning frequency, and stronger attenuation features in the study area. Meanwhile, three outlier wells in the seismic attribute analysis provided a reminder of the uncertainty in geologic interpretation. The gas-sand reservoir evaluation results suggested that the Pareto principle helps to enhance the interpretation needed to determine the productivity distribution of [Formula: see text] tight-gas reservoir in the study area.

Dissolution in He 8 Sandstones, Sulige Gasfield, Ordos Basin: Origin, Distribution, and Effect on Reservoir Properties

2013 ◽  
Vol 807-809 ◽  
pp. 2257-2262
Author(s):  
Wen Ji Lin ◽  
Da Zhen Tang ◽  
Shu Tao
Keyword(s):  
Ordos Basin ◽  
Gas Production ◽  
Reservoir Properties ◽  
Delta Front ◽  
Delta Plain ◽  
Channel Deposits ◽  
Distributary Channel

Dissolution plays a dominant controlling role on reservoir properties in delta sandstone of the Permian He 8 Formation, Sulige gasfield. Dissolution forms intergranular dissolved pore and intragranular dissolved pore. Areas with high percentages of dissolved pores occur along delta-plain distributary channel and delta-front underwater distributary channel deposits. Due to dissolution, the porosity increased to 10-17% with permeability as high as 10md. Wells drilled through He 8 sandstones have high daily gas production of 4~6×104m3/d.

scholarly journals Reservoir Characteristics and Its Comprehensive Evaluation of Gray Relational Analysis on the Western Sulige Gas Field, Ordos Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xinping Liang ◽  
Qingbin Xie ◽  
Mingyu He ◽  
Quanyou Liu ◽  
Vladimir Morozov
Keyword(s):  
Quality Evaluation ◽  
Ordos Basin ◽  
Gas Production ◽  
Gray Relational Analysis ◽  
Burial Depth ◽  
Gas Field ◽  
Field Development ◽  
Relational Analysis ◽  
Body Distribution ◽  
Exploration And Development

Although the Sulige gas field has been developed for several years, accurate reservoir classification, evaluation, and prediction is still a worth-exploring scientific issue as this is a necessary procedure which could give the guidance of well deployment during later gas field development. Here, based on the analysis of lithological features and diagenesis, we give an evaluation of gas reservoirs in the western Sulige gas field by using the improved method of gray relational analysis. Our results show that the study area Su-54 block is dominated by low permeability and low porosity litharenite and lithic silicarenite with clear evidence of strong diagenesis processes. Compaction is believed to be relatively strong due to the great burial depth and destroy most of the primary pores. Based on the premise of a lower limit of an effective reservoir, we select five parameters (permeability ( K ), porosity ( Φ ), effective sand thickness ( M ), effective sand/sand thickness ratio ( D ), and gas saturation ( S g )) to calculate the correlation coefficient, relational degree, and index weights for reservoir quality evaluation. By weighted gray correlation theory, the dynamic testing data—effective thickness of gas production data—is used as mother sequences. The results show that the predicted favorable areas for gas exploration and development coincide well with sedimentary and sand body distribution (e.g., point bars and central bars) in the study block; well blocks such as s372, s373, s374, and e24 could be future key development targets. This also indicates a broader application of the gray relational analysis to quality evaluation and distribution prediction of reservoirs. Therefore, our findings could give a new theoretical and practical guidance for the later gas exploration and development, for the search of hidden stratigraphic lithological traps, and for the improvement of the proven rate of oil and gas resources in this area.

Natural fractures in tight gas sandstones: a case study of the Upper Triassic Xujiahe Formation in Xinchang gas field, Western Sichuan Basin, China

2021 ◽  
pp. 1-18
Author(s):  
Yunzhao Zhang ◽  
Lianbo Zeng ◽  
Wenya Lyu ◽  
Dongsheng Sun ◽  
Shuangquan Chen ◽  
...  
Keyword(s):  
Production Capacity ◽  
Gas Production ◽  
Upper Triassic ◽  
Tight Gas ◽  
Natural Fractures ◽  
Carbon And Oxygen Isotopes ◽  
Gas Field ◽  
Xujiahe Formation ◽  
Western Sichuan ◽  
Tight Gas Reservoir

Abstract The Upper Triassic Xujiahe Formation is a typical tight gas reservoir in which natural fractures determine the migration, accumulation and production capacity of tight gas. In this study, we focused on the influences of natural fractures on the tight gas migration and production. We clarified characteristics and attributes (i.e. dips, apertures, filling degree and cross-cutting relationships) of the fractures based on image logging interpretations and core descriptions. Previous studies of electron spin resonance, carbon and oxygen isotopes, homogenization temperature of fluid inclusions analysis and basin simulation were considered. This study also analysed the fracture sequences, source of fracture fillings, diagenetic sequences and tight gas enrichment stages. We obtained insight into the relationship between fracture evolution and hydrocarbon charging, particularly the effect of the apertures and intensity of natural fractures on tight gas production. We reveal that the bedding fractures are short horizontal migration channels of tight gas. The tectonic fractures with middle, high and nearly vertical angles are beneficial to tight gas vertical migration. The apertures of fractures are controlled by the direction of maximum principal stress and fracture angle. The initial gas production of the vertical wells presents a positive correlation with the fracture abundance, and the intensity and aperture of fractures are the fundamental factors that determine the tight gas production. With these findings, this study is expected to guide the future exploration and development of tight gas with similar geological backgrounds.

Characteristics of gas accumulation in a less efficient tight-gas reservoir, He 8 interval, Sulige gas field, Ordos Basin, China

2016 ◽  
Vol 57 (7) ◽  
pp. 1064-1077 ◽  
Author(s):  
Ding Xiaoqi ◽  
Yang Peng ◽  
Han Meimei ◽  
Chen Yang ◽  
Zhang Siyang ◽  
...  
Keyword(s):  
Ordos Basin ◽  
Tight Gas ◽  
Gas Reservoir ◽  
Gas Field ◽  
Gas Accumulation ◽  
Tight Gas Reservoir
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