Discovery and basic characteristics of the high-quality source rocks of the Cambrian Yuertusi Formation in Tarim Basin
Received date: 2015-12-02
Revised date: 2016-01-04
Online published: 2016-01-10
The Upper Paleozoic strata of Tarim Basin have abundant resources of marine oil and gas.In the Tahe area,Halahatang area,Tazhong area of the basin,many large-scale oilfields have been found.These oilfields have been confirmed with oil and gas reserves more than 2.5 billion tons of oil equivalent and have completed the annual output of more than 14 million tons of marine oil and gas equivalent.The view that the main hydrocarbon source rocks are the Cambrian or Ordovician is still controversial.Geochemists have made much work and effectively guide the oil and gas exploration in Tarim Basin.Because of the complexity of the basin and the limitation of samples,the research work and fine contrast are restricted.In this article,we investigated the Cambrian strata outcrop of Tarim Basin in detail.Through analyzing large amount of outcrops,high-quality hydrocarbon source rocks of Yuertusi Formation have been found in more than 10 outcrop points in Aksu region.The source rocks lithology is black shale,of which total organic carbon (TOC) content are between 2%-16%.Total organic carbon (TOC) of the black shale layer can be up to 4%-16%,especially in outcrops of the Yutixi and Shiairike.This is the best marine hydrocarbon source rock which has found in China by now.The source rocks distribute stably in the Aksu region,the thickness of which is about 10-15m.It is formed in sedimentary environment of middle gentle slope to low gentle slope.Organic matter enrichment is controlled by upwelling currents.Thick strata of dolostone developed in Xiaoerblak Formation are considered as good reservoir of beach and microbial reef in the upper strata of Yuertusi Formation.No hydrocarbon source rocks have been found in outcrop of Xiaoerblak Formation.Thick strata of gyprock and mudstone development are a set of good cap layer in the Lower Cambrian.This hydrocarbon accumulation combination has great exploration potential.
Zhu Guang-you,Chen Fei-ran,Chen Zhi-yong,Zhang Ying,Xing Xiang,Tao Xiao-wan,Ma De-bo . Discovery and basic characteristics of the high-quality source rocks of the Cambrian Yuertusi Formation in Tarim Basin[J]. Natural Gas Geoscience, 2016 , 27(1) : 8 -21 . DOI: 10.11764/j.issn.1672-1926.2016.01.0008
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