气候变化领域集成服务门户(CCPortal): Diagenesis and reservoir quality of lacustrine deep-water gravity-flow sandstones in the Eocene Shahejie Formation in the Dongying sag; Jiyang depression; eastern China

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DOI	10.1306/1016191619917211
	Diagenesis and reservoir quality of lacustrine deep-water gravity-flow sandstones in the Eocene Shahejie Formation in the Dongying sag; Jiyang depression; eastern China
	Yang T.; Cao Y.; Friis H.; Liu K.; Wang Y.; Zhou L.; Yuan G.; Xi K.; Zhang S.
发表日期	2020
ISSN	0149-1423
起始页码	1045
结束页码	1073
卷号	104 期号:5
英文摘要	The lacustrine deep-water gravity-flow sandstone reservoirs in the middle of the third member of the Shahejie Formation (43.7–38.2 Ma) are the main exploration targets for hydrocarbons in the Dongying sag, Jiyang depression, eastern China. The impact of diagenesis on reservoir quality of these sandstones has been established by a variety of methods. Petrographically, the sandstones consist mainly of lithic arkose (with 43% of quartz, 33% of feldspar, and 24% of lithic fragment) with reservoirs having average porosity and permeability values of 17.1% and 38.1 md, respectively. In addition to their primary intergranular pores, secondary pores are well developed from feldspar dissolution, with pore-throat radii ranging from 0.01 to 40 mm. The dissolution of feldspar and transformation of smectite to illite may be the sources of silica for the first phase of quartz overgrowth, whereas illitization of kaolinite may be responsible for the second phase of quartz overgrowth. In addition, pressure dissolution of quartz is also an important source of silica for quartz overgrowth. Dissolution of feldspar has little impact on reservoir quality, whereas compaction and carbonate cementation are the main factors significantly reducing reservoir quality. Oil charge may have retarded carbonate cementation and generated overpressure that retarded compaction, thus preserving porosity. Precipitation of vermicular kaolinite, resulting from feldspar dissolution, promoted a change in the wettability of the reservoir, from water wet to oil wet, which is beneficial for oil entrapment. The central parts of medium- to thick-bedded sandstones that have experienced oil charge twice appear to have the highest-quality reservoirs based on petrophysical properties. This work provides a new interpretation of the formation mechanism of high-quality lacustrine deep-water gravity-flow sandstones reservoirs that have experienced multiple periods of oil charge. Copyright ©2020. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Cementing (shafts); Compaction; Dissolution; Feldspar; Kaolinite; Petroleum prospecting; Petrophysics; Porosity; Quartz; Sandstone; Sedimentology; Textures; Carbonate cementation; Exploration targets; Feldspar dissolution; Formation mechanism; Petrophysical properties; Pressure dissolution; Sandstone reservoirs; Sandstones reservoirs; Petroleum reservoir engineering; deep water; diagenesis; Eocene; gravity flow; hydrocarbon exploration; hydrocarbon reservoir; kaolinite; overpressure; permeability; reservoir; sandstone; smectite; China; Dongying; Shandong
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143706
作者单位	State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China; Department of Geology, Laboratory of Deep Oil and Gas, School of Geosciences, China University of Petroleum (East China), Qingdao, China; Department of Geoscience, Aarhus University, Aarhus, Denmark; Department of Geology, Irish Centre for Research in Applied Geosciences, School of Natural Sciences, Trinity College Dublin, Dublin, Ireland
推荐引用方式 GB/T 7714	Yang T.,Cao Y.,Friis H.,et al. Diagenesis and reservoir quality of lacustrine deep-water gravity-flow sandstones in the Eocene Shahejie Formation in the Dongying sag; Jiyang depression; eastern China[J],2020,104(5).
APA	Yang T..,Cao Y..,Friis H..,Liu K..,Wang Y..,...&Zhang S..(2020).Diagenesis and reservoir quality of lacustrine deep-water gravity-flow sandstones in the Eocene Shahejie Formation in the Dongying sag; Jiyang depression; eastern China.AAPG Bulletin,104(5).
MLA	Yang T.,et al."Diagenesis and reservoir quality of lacustrine deep-water gravity-flow sandstones in the Eocene Shahejie Formation in the Dongying sag; Jiyang depression; eastern China".AAPG Bulletin 104.5(2020).