查干凹陷下白垩统有效烃源岩识别及其控藏作用

doi:10.3969/j.issn.1673-8926.2015.02.004

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 18-25.doi: 10.3969/j.issn.1673-8926.2015.02.004

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Identification of effective source rocks of Lower Cretaceous and its controlling on hydrocarbon accumulation in Chagan Depression

WANG Peng¹， L IU Guangdi¹， CAO Zhe¹， SU Hui²， CHANG Junhe²

1. College of Geosciences ， China University of Petroleum ， Beijing 102249 ， China ； 2. Research Institute of Exploration and
Development ， Sinopec Zhongyuan Oilfield Company ， Puyang 457001 ， Henan ， China

Online:2015-03-03 Published:2015-03-03

Abstract

Abstract:

Identification of effective source rocks is the basis of research on hydrocarbon reservoir-forming in sedimentary basins, and the distribution of effective source rocks has important controls on hydrocarbon accumulation. Based on the characteristics of hydrocarbon generation and expulsion of source rocks, this paper fully considered the control functions of expulsion on hydrocarbon accumulation and analyzed the relations of TOC content with chloroform bitumen “A” and pyrolysis parameter S₁. It is considered that the real contributors to hydrocarbon reservoir of Lower Cretaceous are the source rocks whose TOC content is over 1.0%. The logging ΔlogR method was used to predict TOC content in single well. The lowest limit of TOC content was chose as evaluation criteria to determine the thickness and the plane distribution characteristics of effective source rocks in different prospecting wells. The study result shows that effective source rocks mainly distributed in gentle slope belt in Chagan Depression. The thickness of effective source rocks in trough is even thinner. Hydrocarbon reservoirs are mainly enriched in the updip direction of gentle slope belt rather than deep trough. Through the analysis of the superimposition of source-reservoir distribution, oilsource correlation and the match of hydrocarbon generation and accumulation stage, it is believed that hydrocarbon which is generated by effective source rocks in gentle slope belt migrates to trap and forms reservoir through sand bodies and fault. The distribution of effective source rocks in gentle slope belt has significant control on hydrocarbon accumulation in Chagan Depression.

Key words: tight oil, resources potential, Paleogene, Neogene, western Qaidam Basin

WANG Peng， L IU Guangdi， CAO Zhe， SU Hui， CHANG Junhe. Identification of effective source rocks of Lower Cretaceous and its controlling on hydrocarbon accumulation in Chagan Depression[J].Lithologic Reservoirs, 2015, 27(2): 18-25.

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