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Characteristics of micro-pore structure and main controlling factors of physical properties in tight sandstone reservoirs of the Xujiahe Formation

Characteristics of micro-pore structure and main controlling...

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2023年中国地球科学联合学术年会

作者： Wang zhiguo Exploration and Development Research Institute of Daqing Oilfield Co Ltd

The heterogeneity of the tight sandstone reservoirs of the Xujiahe Formation in northeast Sichuan is strong, and the gas-water relationship is complicated, which seriously restricts efficient exploration and development. Therefore, clarifying the main rock types, revealing the micro-pore structural characteristics of the reservoirs, and the main controlling factors of the physical properties can help to understand the spatial evolution regulations of the high-quality gas reservoirs, and to identify the favorable areas of the sweetspot of the tight sandstone reservoirs of the Xujiahe Formation in northeast Sichuan, thus further liberating the resource potential of the Xujiahe Formation. In this paper, 36 samples of dense sandstone of the Xujiahe Formation from the YQ1 well in northeast Sichuan were selected to reveal the main rock types and mineral components of the dense sandstone of the Xujiahe Formation in northeast Sichuan, to clarify the characteristics of the micropore structure, and to explore the main controlling factors of its physical heterogeneity by using experimental methods such as XRD, FE-SEM, low-temperature N2, MICP, and NMR as well as well-logging data. The results show that the sandstones of the Xujiahe Formation in northeastern Sichuan are mainly composed of quartz and feldspar, with a small amount of carbonatite and clay, of which the lithology of the Xu3 lower of the Xujiahe Formation is dominated by feldspathic quartz sandstone, feldspathic feldspathic sandstone, feldspathic sandstone, and feldspathic sandstone, sections 4 and 6 are mainly feldspathic quartz sandstone and clastic quartz sandstone;The Xu3 lower and Xu4 are mainly intergranular pores, heterogeneous matrix pores and intra-granular dissolution pores, and are mainly matrix pore-type reservoirs, while the Xu6 is mainly micro-cracks and intergranular pores, and develops fracture-type reservoirs, and the physical properties of the reservoirs gradually deteriorate from the Xu3 lower s t

关键词： microscopic pore structures heterogeneity controlling Factors tight sandstone reservoirs xujiahe formation

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Study on natural gas enrichment model of tight sandstone reservoirs in Xu2 section of Yingshan area

Study on natural gas enrichment model of tight sandstone res...

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2023年中国地球科学联合学术年会

作者： Wang youzhi Exploration and Development Research Institute of Daqing Oilfield Co Ltd

The prospect of tight gas exploration in the Xujiahe Formation in the Sichuan Basin is promising, but the lack of understanding of the gas-water relationship and the enrichment law is the limited bottleneck for the beneficial development of tight gas in the Xujiahe Formation. Comprehensively utilizing the data from well logging and experiments in the Yingshan area, based on the theory of high-resolution sequence stratigraphy, we re-conceptualize the mechanism of tight gas formation in the Yingshan tectonics. The results show that through the identification of different levels of stratigraphic interfaces and lake flooding surfaces, the tight sandstone reservoirs of the Xu2 section in the Yingshan area can be categorized into one long term datum cyclone, and another six medium term datum cyclones, from bottom to top, as MSCl-MSC6. Among them, MSCl-MSC4 lithological assemblage pattern is regressive-accumulative, and MSC5-MSC6 develops intrusive-accumulative lithological assemblage. The rock combination and compositional characteristics of the ascending gyratory rocks have better compressive resistance, better physical conditions, and after tectonic adjustment, the gas-water dissimilarity is complete, and tectonic oil reservoirs are developed. The downward spiral sandstone reservoir of Xujiahe in Yingshan area has experienced relatively strong mechanical compaction, which seriously damaged the primary porosity of the reservoir, resulting in serious tightening of the tight sandstone reservoir in the work area, and the period of oil and gas injection into the reservoir is coupled with the tightening evolution of the reservoir. It has the characteristics of tightening-while-forming, which makes the descending cyclone as a whole gas-bearing and enriched in scale, and it is a favorable target for the future reserve upgrade of the Xu2 section of the Yingshan tectonics of the Xujiahe Formation. The aim is to provide an important reference and basis for the exploration of tight

关键词： xujiahe formation tight sandstone reservoirs Xu2 section enrichment model

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Diagenetic evolution of clastic reservoirs and its records in fine subsection:significance and application

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Acta Geochimica 2022年第5期41卷 887-892页

作者： Manwei Zhang Hongjing Zhao Taiju Yin Wendao Qian Anxin Mei Fan Liu Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze UniversityWuhanHubeiChina School of Geosciences Yangtze UniversityWuhanHubeiChina College of Marine Science and Technology China University of GeosciencesWuhanHubeiChina School of Environment and Resource Xichang UniversityXichangSichuanChina Chuanqing Drilling Engineering Company Limited Sulige Project Management Department Sichuan Chengdu ChengduChina

It was showed that understanding of the diagenetic modifications and its associated products in the deeply to ultra-deeply buried tight sandstone reservoirs(DUDTSR)is great important for reservoir characterization and hydrocarbon ***,the fine characterization of diagenetic evolution via geologic modelling in tight sandstones remains a great challenge as for complexity of lithology,temperature,pressure and formation fluid throughout the entire life cycle of tight sandstone *** help get a comprehensive idea of the distribution of diagenetic processes on the formation of DUDTSR in the long geological period,type-I and type-II fine sections of diagenetic stage for clastic reservoirs were creatively proposed and its essence was illustrated using the Paleogene Huagang(EH)Formation in the southern Xihu *** combination of both quantitative and qualitative methods which began with current formation temperature,vitrinite analysis,illite and I/S mixed layers based on analytical testing of the EH Formation,(1)Paleotemperature(T),vitrinite reflectivity and smectite in mixed layer during burial processes were restored based on numerical analysis,(2)The accurate division of diagenetic evolution was identified from coarse to fine process using new model,(3)And finally the geological significance of fine division of the conventional diagenetic stage was illustrated for low-porosity and tight sandstone reservoirs.

关键词： tight sandstone reservoirs Diagenetic evolution Fine subsection Significance

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Physical-property cutoffs of tight reservoirs by field and laboratory experiments: a case study from Chang 6, 8–9 in Ordos Basin

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Frontiers of Earth Science 2021年第2期15卷 471-489页

作者： Bingbing SHI Xiangchun CHANG Zhongquan LIU Ye LIU Tianchen GE Pengfei ZHANG Yongrui WANG Yue WANG Lixin MAO College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Petroleum Exploration and Development Research Institute Shengli Oilfield Company of SINOPECDongying 257015China Jiangsu Design Institute of Geology for Mineral Resources Xuzhou 221006China

tight sandstone reservoirs are generally characterized by complex reservoir quality,non-Darcy flow,and strong *** utilized for evaluating physical property cutoffs of conventional reservoirs maybe ***,a comprehensive investigation on physical property cutoffs of tight sandstone reservoirs is crucial for the reserve evaluation and successful *** this study,a set of evaluation approaches take advantage of field operations(i.e.,core drilling,oil testing,and wireline well logging data),and simulation experiments(i.e.,high-pressure mercury injection-capillary pressure(MICP)experiment,oil-water relative permeability experiment,nuclear magnetic resonance(NMR)experiment,and biaxial pressure simulation experiment)were comparatively optimized to determine the physical property cutoffs of effective reservoirs in the Upper Triassic Chang 6,Chang 8 and Chang 9 oil layers of the Zhenjing *** results show that the porosity cutoffs of the Chang 6,Chang 8,and Chang 9 oil layers are 7.9%,6.4%,and 8.6%,and the corresponding permeability are 0.08 mD,0.05 mD,and 0.09 mD,*** with wireline well logging,mud logging,and oil testing,the cut-off of the thickness of single-layer effective reservoirs are approximately 3.0 m,3.0 m,and 2.0 m,*** on the cutoffs of critical properties,a superimposed map showing the planar distribution of the prospective targets can be mapped,which may delineate the effective boundary of prospective targets for petroleum exploration of tight sandstone reservoirs.

关键词： tight sandstone reservoirs cutoffs of petrophysical property field operations simulation experiments Yanchang Formation Ordos Basin

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High-Inclination Coring of Chang-63 of the Yanchang Formation in Huaqing Oilfield, Ordos Basin: Implications for Ancient Flow Direction and Fracture Orientation

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Engineering（科研） 2023年第1期15卷 24-46页

作者： Kun Chen Xuefeng Qü Qichao Xie Jian Liu Jiwei Wang Youan He Dong Sun Yexiong Peng Research Institute of Exploration and Development PetroChina Changqing Oilfield Company Xi’an China No. 10 Oil Production Plant PetroChina Changqing Oilfield Company Qingyang China

A promising method is to use coring of high-inclination well to find ancient flow direction and orient tiny natural fractures in massive sandstone of sandy debris flow. Determination of ancient flow direction can reduce the number of exploration wells, and orientation of natural fractures is of guiding significance to the deployment of water injection development well pattern. In Block X of Huaqing Oilfield, Ordos Basin, the cores of Chang 63 section were obtained from Well Y through 16 coring operations, with a total length of 105 m. Cores is oriented through drilling parameters, the number of cores, the angle between the core edge and horizontal bedding, the coincidence degree of core profile and directional flame structure. Therefore, the micro-fractures on the core are directional. The ancient flow directions of sandy debris flow were restored by load casting, groove casting, groove casting and imbricate structure. Our results show that the ancient flow directions of sandy debris flows were southwest, southeast, northwest, and west from bottom to top. The front of the Wuqi Delta is the main source of blocky sandstone with the best oil-bearing property. Affected by the topography of the lake bottom, the sandy debris flow turned locally in the northeast direction, and the sandy debris flow from this direction was formed. The NEE-SWW-trending fractures formed in the Yanshanian period are most developed in the Huaqing area, which should be considered in deploying the flooding well network. The north-south micro-fractures formed in the Himalayan period can improve the physical properties of tight sandstone, which is of great significance for tight sandstone reservoirs.

关键词： Core Orientation tight sandstone reservoirs Sandy Debris Flow

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