中国鄂尔多斯盆地东南部二叠系下统山西组致密气砂岩的成岩演化和烃荷对比

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Binfeng Cao , Xiaorong Luo , Richard H. Worden , Xiangzeng Wang , Yonghong He , Xiangyang Qiao , Likuan Zhang , Yuhong Lei , Jinsong Zhou , Chao Deng
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引用次数: 0

摘要

在中国鄂尔多斯盆地东南部的延安气田,下二叠统山西地层致密砂岩的储层质量和产气率差异很大。有效的储层对于致密气勘探和生产的经济成功意义重大。本研究考察了成岩演化、孔隙度降低和烃充注之间的关系,以揭示该气田有效储层的形成和分布。砂岩为细粒至粗粒的石英闪长岩、亚闪长岩和闪长岩。砂岩质地和矿物成分的巨大变化对成岩异质性和孔隙分布具有重要的控制作用。共分为五个岩相(岩相-A 至岩相-E)。不同岩相经历了截然不同的成岩演化和石油充填历史。中粗粒石英网纹岩(岩相-A)和亚石英网纹岩(岩相-C)经历了较少的韧性压实和胶结以及广泛的晶粒溶解,在早期烃类赋存之前仍然相对多孔。当天然气生成和迁移达到峰值时,岩相-A 和岩相-C 仍具有适度的孔隙度,能够充气。相反,细粒、凝灰岩质石英闪长岩(岩相-B)、富含韧性颗粒的砂岩(岩相-D)和碳酸盐胶结紧密的砂岩(岩相-E)在成岩过程中经历了有限的成岩改造,以韧性压实或碳酸盐胶结为主,导致孔隙度大量丧失。岩相-B、-D 和-E 在早期石油充注之前孔隙度较低。因此,岩相-A 和岩相-C 是山西地层致密储层中唯一有效的储集岩。这项研究表明,岩相对于延安气田和全球其他致密气田的储层特征描述和建模非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Contrasting diagenetic evolution and hydrocarbon charge of tight gas sandstones in the lower Permian Shanxi Formation, southeastern Ordos Basin, China
Reservoir quality of, and gas production rates from, tight sandstones in the Lower Permian Shanxi Formation vary greatly across the Yan’an Gas Field, southeastern Ordos Basin, China. Effective reservoirs are significant for the economic success of tight gas exploration and production. This study examined the relationships between diagenetic evolution, porosity reduction and hydrocarbon charge to reveal the formation and distribution of effective reservoirs in this field. The sandstones are very fine- to coarse-grained, quartz arenites, sub-litharenites and litharenites. The significant variations in the texture and mineralogical composition of the sandstones exert major controls on diagenetic heterogeneity and pore distribution. Five petrofacies (petrofacies-A to -E) are classified. The various petrofacies experienced contrasting diagenetic evolution and petroleum charge histories. The medium- to coarse-grained, quartz arenites (petrofacies-A) and sub-litharenites (petrofacies-C) experienced less ductile compaction and cementation and extensive grain dissolution, and remained relatively porous before early hydrocarbon emplacement. When peak gas generation and migration occurred, petrofacies-A and -C still had moderate porosity and were able to be charged. On the contrary, the fine-grained, tuffaceous quartz arenites (petrofacies-B), ductile grain-rich sandstones (petrofacies-D) and tightly carbonate-cemented sandstones (petrofacies-E) experienced limited diagenetic alterations with ductile compaction or carbonate cementation predominating and leading to extensive loss of porosity during eodiagenesis. Petrofacies-B, -D and -E had low porosity before early petroleum charge. Petrofacies-A and -C therefore constitute the only effective reservoir rocks of tight reservoirs of the Shanxi Formation. This study indicates that petrofacies is useful for reservoir characterization and modeling in the Yan’an Gas Field and other tight gas fields worldwide.
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来源期刊
Journal of Asian Earth Sciences
Journal of Asian Earth Sciences 地学-地球科学综合
CiteScore
5.90
自引率
10.00%
发文量
324
审稿时长
71 days
期刊介绍: Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance. The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.
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