Abstract:
Objective Recently, a set of thick Eocene oil shale was drilled in Songxi Sag, which is the first time the oil shale was drilled in Qiongdongnan Basin. In order to implement the hydrocarbon generation potential of the Eocene oil shale and promote further exploration in songxi sag, Qiongdongnan Basin.
Methods this article is based on drilling records, elemental assays and a series of geochemical tests to study the characteristics and formation environment of oil shale and predict the resource potential of this oil shale.
Results The analysis results show that the average Total Organic Carbon (TOC) of this set of oil shale was 3.33%, the average pyrolysis hydrocarbon potential (S1+S2) was 22.2 mg/g, and the average Hydrogen Index (HI) was 606 mg/g TOC. The sedimentary environment of this oil shale is a warm semi−humid reduced freshwater lake environment, which has the characteristics of mixed input of lower aquatic organisms and higher terrestrial plants.
Conclusions It shows that the oil shale has high organic matter abundance, good type and high paleoproductivity, which is a good to high−quality source rock. Its crude oil resources are about 41.4 million tons, with huge potential for crude oil resources.Both conventional oil and gas and shale oil have great exploration potential.
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