Received date: 2007-08-21
Revised date: 2007-09-28
Online published: 2008-06-20
To analyze the petroleum condition and hydrocarbon accumulation in the Leting sag of Bohai Bay basin, the Lower Tertiary petroleum system is studied. It is shown that there is plenty of mature source rock and large scale distribution of dark mudstone which has the ability of hydrocarbon-generation. Both the middle-lower Es3 and lower Es1 argillaceous rocks have excellent seal ability. There are two reservoir patterns: source below and reservoir above, self source-reservoir. In this sag, four traps are found: fault block or fault nose trap, lithologic trap, stratigraphic trap and complex trap. Channels for oil migration are as follows: sandstone, fault and unconformity surface. The formation of the Lower Tertiary petroleum system experienced three main stages, including uplifting and folding, faulting, and sedimentation. The Lower Tertiary petroleum system is evaluated based on the parameter of source rock potential. It suggests that the “self source\|reservoir” by lateral migration has better oil accumulation conditions than the “source below and reservoir above” by vertical migration.
Key words: Source rock; Trap; Petroleum system; Lower Tertiary; Bohai Bay basin.
CHENG Yong-sheng ;CHEN Song-ling ;WANG Hai;CANG Feng ;LIU Juan . LOWER TERTIARY PETROLEUM SYSTEM INLETING SAG, BOHAI BAY BASIN[J]. Natural Gas Geoscience, 2007 , 18(6) : 854 -858 . DOI: 10.11764/j.issn.1672-1926.2007.06.854
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