| By comprehensively use of petroleum geology, geochemical, geophysical data and previous research results, this article has evaluated the distribution, the heat evolution and petroleum resource potential of the coa1-bearing source rock, and estimated the oil and gas accumulated of all structural zones , and elected the favorable oil-gas accumulation zones.Coal source rock in research area had coal, carbonaceous shale and mudstone.Vitrinite was the most component in the carbonaceous shale and coal,so their organic type isⅢ,but the kerogen of mudstone isⅡ2-Ⅱ1.The content of TOC about coal betweened 30% and 80%, but lower in mudstone, to which the number is 1.5-2.5%. Most part of source rock is in the stage of mature stage to post- maturity, with the vitrinite reflectance reached 1.0-2.0%. By used the calculation results of secondary hydrocarbon generation about all the sags,found that the center of secondary hydrocarbon generation located in Yucheng Sub-sag, Shenzhuang Sub-sag and Jiazhai Sub-sag, and the Eastern Sub-sag in Dongpu Sag, the maximum number of hydrocarbon generation strength was 50-60×10~8m~3/km~2.The age of secondary hydrocarbon generation is quite different in different tectonic unit, which the secondary hydrocarbon generation happened 48Ma ago is effective. The center of the secondary hydrocarbon generation controled the oil-gas accumulation. Through the calculation of the quantity of hydrocarbon accumulation in positive structures,this paper has analyzed the prospects of the oil and gas exploration in studied area, and pointed out that Wenliu-Weicheng-Wenmingzhai Structural zone, Xuji-Machang Structural zone in Dongpu Sag, and Jiazhai buried hill in Shenxian Sag are the favorable exploration objectives.
|
PDF Full Text Request