Carbonate Reservoirs Cycles and Assemblages under the Tectonic and Palaeogeography Control: A Case Study from Sichuan Basin

被引：5
|
作者：
Xing F. [1 ,2 ]
Hu H. [1 ,2 ]
Hou M. [1 ,2 ]
Lu Y. [3 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology, Chengdu University of Technology, Chengdu
[2] Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu
[3] Faculty of Earth Resource, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2018年 / 43卷 / 10期
关键词：
Carbonate reservoirs; Craton; Intracratonic sags; Paleo-uplift; Paleozoic; Petroleum geology; Reservoir assemblage; Sichuan Basin;
D O I：
10.3799/dqkx.2018.310
中图分类号：
学科分类号：
摘要：
The oil/gas exploration of marine carbonate rocks in Sichuan basin has achieved a lot of breakthroughs. Several large gas field clusters have been gradually presented, and have shown the clumped distribution characteristics of carbonate reservoirs, while the assemblage structure of the reservoirs and its spatial and temporal distribution remain to be further discussed. Based on previous studies, combined with the comprehensive research on marine carbonate reservoirs in Sichuan Basin, the types, texture, and major controlling factors of carbonate cycles and assemblages under the control of tectonic and paleogeography have been systematically studied. Limited by stable clastic rock strata and large unconformity surfaces, eight carbonate cycles are divided in this paper, and each cycle has different reservoir compositions.The cycles include dolomite favorable for reservoirs such as ones of Sinian to Lower Ordovician, and Middle Permian to Middle Triassic.Combined with the tecotonic space-time distribution, and lithofacies paleography of reservoirs, carbonate rock assemblages are divided into several vertical cycles including: (1) stable platform edge reefs and shoals reservoirs on the edge of Upper Yangtze plate, (2) supergene karstification and grain beach dolomite around continuous migration paleo-uplift, (3) algal dolomite and intra-platform shoals under the background of tidal flat in the plate, (4) reef and beach dolomite reservoirs on the both sides of platform margin and intra-platform depression controlled by faults in the plate, and (5) dense limestone and karst reservoirs of carbonate ramp. It is suggested that carbonate reservoirs assemblages are controlled by dolomite which has been protected by early oil and gas charging. Carbonate reservoirs assemblages are influenced by tectonics, sea-level, and lithofacies paleography. And other factors such as karst, TSR, and hot fluids etc. influence carbonate reservoirs in local area. © 2018, Editorial Department of Earth Science. All right reserved.
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页码：3540 / 3552
页数：12
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