首页|Multi-Scale Pore Structure Heterogeneity in Tuff Reservoirs Investigated with Multi-Experimental Method and Fractal Dimensions in Chang 7 Formation,Southern Ordos Basin

Multi-Scale Pore Structure Heterogeneity in Tuff Reservoirs Investigated with Multi-Experimental Method and Fractal Dimensions in Chang 7 Formation,Southern Ordos Basin

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The tight tuff reservoir is an unusual type of unconventional reservoir with strong hetero-geneity.However,there is a lack of research on the microscopic pore structure that causes the heteroge-neity of tuff reservoirs.Using the Chang 7 Formation in Ordos Basin,China as a case study,carbon-dioxide gas adsorption,nitrogen gas adsorption and high-pressure mercury injection are integrated to investigate the multi-scale pore structure characteristics of tuff reservoirs.Meanwhile,the fractal di-mension is introduced to characterize the complexity of pore structure in tuff reservoirs.By this multi-experimental method,the quantitative characterizations of the full-range pore size distribution of four tuff types were obtained and compared in the size ranges of micropores,mesopores and macropores.Fractal dimension curves derived from full-range pores are divided into six segments as D1,D2,D3,D4,D5 and D6 corresponding to fractal characteristics of micropores,smaller mesopores,larger meso-pores,smaller macropores,medium macropores and larger macropores,respectively.The macropore volume,average macropore radius and fractal dimension D5 significantly control petrophysical proper-ties.The larger macropore volume,average macropore radius and D5 correspond to favorable pore structure and good reservoir quality,which provides new indexes for the tuff reservoir evaluation.This study enriches the understanding of the heterogeneity of pore structures and contributes to unconven-tional oil and gas exploration and development.

tuff reservoirpore structurecarbon-dioxide gas adsorptionnitrogen gas adsorptionhigh-pressure mercury injectionfractal dimensionpetroleum geology

Hao Lu、Qing Li、Dali Yue、Dongdong Xia、Shenghe Wu、Lang Wen、Yu He

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State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China

College of Geosciences,China University of Petroleum,Beijing 102249,China

Petroleum Exploration and Development Institute of SINOPEC,Beijing 100083,China

Strategic Cooperation Technology Projects of CNPC and CUPBNational Science and Technology Special国家自然科学基金Science Foundation of China University of Petroleum,Beijing

ZL-ZX2020-022017ZX05049-006-001416021372462020YXZZ 022

2024

10.1007/s12583-023-1857-8

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(2)
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