科研之友
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摘要
The Kekeya natural gas reservoir of lower Jurassic was discovered in northern piedmont zone in Turpan-Hami basin. In order to define the character, the origin and the accumulation mode of the gas during middle-upper Jurassic oil accumulation, geochemical and dissection of gas accumulation were studied. The results show that the gas is humic type deviated sapropel with the carbon isotope ratio of methane from -44.0‰ to -38.7‰ and carbon isotope ratio of ethane from -29.0‰ to -27.5‰. The physical property and biomarker feature of association oil present that this coal measure mature oil has different origins from middle-upper Jurassic hydrocarbon. So the geologic conditions and the data of geochemistry prove that the gas is in mature phase with short vertical migration distance and is from coal measure source rock of Badaowan Formation. The tight sand reservoir distributed widely has been formed before natural gas filled in, and lower Jurassic abnormal overpressure developed, and the resource and the reservoir superposed intensely. Because of these tight sand gas reservoir forming conditions, this independent gas system which is the new natural gas exploration in Tuha basin is formed.
- 出版日期2012
- 单位中国石油大学（华东）
