Hydrocarbon accumulation of composite-buried hill reservoirs in the western subsag of Bozhong Sag, Bohai Bay Basin

被引：0
|
作者：
Xie Y. [1 ]
Luo X. [2 ,3 ]
Wang D. [1 ]
Xu C. [1 ]
Xu Y. [2 ,3 ]
Hou M. [2 ,4 ]
Chen A. [2 ,4 ]
机构：
[1] China National Offshore Oil Corp., Beijing
[2] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Chengdu University of Technology, Chengdu, 610059, Sichuan
[3] College of Energy Resources, Chengdu University of Technology, Chengdu, 610059, Sichuan
[4] Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, 610059, Sichuan
来源：
Natural Gas Industry | 2019年 / 39卷 / 05期
关键词：
Allocation relationship; Bohai Bay Basin; Buried-hill; Composite hydrocarbon reservoir; Mesozoic; Oil source correlation; Shallow oil and gas reservoir; Western subsag of Bozhong sag;
D O I：
10.3787/j.issn.1000-0976.2019.05.002
中图分类号：
学科分类号：
摘要：
There are abundant hydrocarbon resources in the western subsag of Bozhong sag in the Bohai Bay Basin, where oil-gas discoveries have been made in those shallow Neogene and Paleogene reservoirs and deep Mesozoic buried hill reservoirs, but no better understandings have yet been achieved in terms of the process of hydrocarbon accumulation and the relationship between deep buried hill reservoirs and the allocation of shallow reservoirs. Based on the organic geochemical analysis of source rocks and basin modeling of hydrocarbon generation evolution, distribution characteristics of fluid inclusion and homogeneous temperature measurement, combined with the characteristics of oil-source biomarkers, the process of hydrocarbon accumulation in this study area was resumed based upon the regional tectonic background. The following findings were obtained. (1) There are 3 sets of source rocks in the third and first members of Paleogene Shahejie Fm, and the second lower member of Paleogene Dongying Fm; the reservoirs in the peripheral uplift zones include Mesozoic volcanic rocks, Archean metamorphic rocks, and Paleogene-Neogene delta-fluvial porous sandstones. Hydrocarbon generated in this sag migrated along the fault unconformity surface to the slope before accumulated in the peripheral tectonic zones, resulting in 3 sets of source-reservoir-caprock assemblages formed with the characteristics of reservoir formation in compound oil and gas accumulation zones. (2) The stratum in the third member of Shahejie Fm is the main source rock. (3) The above three assemblages went through four periods of generating process during the geological time of 11-1 Ma. Vertically hydrocarbon sources first filled in the deep Mesozoic and Archean reservoirs, then migrated and accumulated in the shallow Neogene and Paleogene reservoirs, where multiple shore-term rapid filling of high-temperature fluids led to this typical oil and gas pooling mode. © 2019, Natural Gas Industry Journal Agency. All right reserved.
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页码：15 / 24
页数：9
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