THE GENERATION AND CHARACTERISTICS OF SOURCE ROCKS IN NANPU OIL-RICH DEPRESSION, BOHAI BAY BASIN
Received date: 2006-12-25
Revised date: 2007-01-09
Online published: 2008-06-20
In recent years, oil-gas exploitation has significant progress and Nanpu depression is found as one of the most oil-rich depressions in Bohai bay Basin. Through the exhaustive research, organic-rich source rocks are identified within Shahejie Formation(Es),especially the TOC(total organic carbon)get the peak abundance in Es34 formation and values commonly exceed 5%. During the early Eocene period when major faulted depression movement occurred, lacustrine basin occupied the largest area and water depth arrived at the highest level in history; wide-spread gray, black mudstone, calcareous mudstone and oil shales prevailed over thestage, which were characteristic of magnificent thickness. The second importanthydrocarbon source rocks are fine-grain dark mudstone which develop within Es33 formation. Generally, hydrocarbon source rocks verified in the Es33 member are responsible for the most of hydrocarbon generation that is estimated upto 70%. Although Es1member is not comparative with Dongying(Ed) formation in thickness, yet on account of the higher evolution degree, the two source rocks approximately provide nearly 15% oilproduction separately.
ZHENG Hong-juDONG Yue-xia;WANG Xu-dong;ZHANG Shui-chang;ZHANG Da-jiang;ZHU Guang-you;XIONG Ying;YU Hai-dong . THE GENERATION AND CHARACTERISTICS OF SOURCE ROCKS IN NANPU OIL-RICH DEPRESSION, BOHAI BAY BASIN[J]. Natural Gas Geoscience, 2007 , 18(1) : 78 -83 . DOI: 10.11764/j.issn.1672-1926.2007.01.78
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