北黄海盆地东部坳陷勘探突破对我国近海残留“黑色侏罗系”油气勘探的启示

doi:10.13278/j.cnki.jjuese.20180150

Abstract

Abstract: The latest exploration and research confirm that there are two sets of effective source rocks developed in the Middle and Upper Jurassic of the eastern sag in the North Yellow Sea basin, and the Upper Jurassic exists as the main source rock for oil & gas accumulation. Within the range of hydrocarbon supply, two patterns of oil & gas reservoir-forming assemblages, i.e., "lower generation and upper accumulation" in the Upper Jurassic-Lower Cretaceous and "self-generation and self-accumulation" in the Middle-Upper Jurassic, have been formed in this area, where the exploration breakthrough of petroliferous basins has been made with Jurassic as the only source rock in the eastern sea area of China. In order to further explore the resource potential and exploration prospects of the remaining "black Jurassic" in China's offshore basins, the authors analyzed their distribution characteristics and geochemical characteristics comprehensively based on seismic-geological interpretation, geochemical analysis and basin modeling. The results show that the residual Jurassic dark mudstone source rocks in China offshore are highly heterogeneous, most of them belong to medium grade source rocks, and some are "medium-good" and some are "medium-poor". The dark Jurassic source rocks in the offshore of China had two periods of hydrocarbon generation and expulsion, Late Jurassic to Early Cretaceous and Eocene to Late Miocene, with total amount of hydrocarbon generation of 1.4×10¹¹t. This provides a sufficient material basis for the formation of source-reservoir combinations including Jurassic "self-generation and self-accumulation" and Jurassic-Cretaceous (or Cenozoic) "lower generation and upper accumulation" in eastern sea basins of China, and has important practical and scientific significance for oil and gas exploration of residual "black Jurassic" in offshore basins of China.

Key words: Black Jurassic, source rock evaluation, hydrocarbon accumulation combination, Eastern Sag of North Yellow Sea basin, Chinese offshore

CLC Number:

P618.13

Xiao Guolin, Cai Laixing, Guo Xingwei, Dong Heping, Pang Yumao. Exploration Enlightenment on Residual “Black Jurassic” in Chinese Offshore from Exploration Breakthrough in Eastern Sag of the North Yellow Sea Basin[J].Journal of Jilin University(Earth Science Edition), 2019, 49(1): 115-130.

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Exploration Enlightenment on Residual “Black Jurassic” in Chinese Offshore from Exploration Breakthrough in Eastern Sag of the North Yellow Sea Basin

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