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Reservoir-forming mechanism and its exploration potential of Songliao Basin in the southern area of Changling Depression
LI Hao1, LU Jianlin1, WANG Baohua1, ZUO Zongxin1, LI Ruilei2, ZHU Jianfeng2, SHEN Zhijie3
(1.Wuxi Petroleum Geology Research Institute of SINOPEC, Wuxi 214126, China;2.Exploration and Development Research Institute, Northeast Oil & Gas Branch, SINOPEC, Changchun 130062, China;3.The Fourth Oil Production Plant, PetroChina Huabei Oilfield Company, Langfang 065000, China)
Abstract:
The hydrocarbon genesis and reservoir-forming of Longfengshan in the southern Changling Depression was investigated using the geochemical characteristics of natural gas composition, light hydrocarbon fingerprint, carbon isotopes and biomarker, as well as the reservoir fluid inclusion. Also the geological condition and hydrocarbon generation-thermal histories were combined to study the reservoir-forming mechanism. The results show that the genesis of gas in Longfengshan sub-sag is a gas mixture composed of humic and sapropelic gas which consists of oil cracked gas and kerogen thermal degradation gas. It is also found that the natural gas and condensate of reservoir is mainly K1sh Formation source rock, in which the maturity of oil is lower than that of natural gas. This is the product of different thermal evolution stages of the same oil source, which belongs to the secondary condensate reservoir. The reservoir-forming exhibits the multi-stage reservoir model of "single source for hydrocarbon, multi-type carrier system and early kerogen catalyzed gas accumulation and late oil cracked gas accumulation". The developed excellent source rocks and the formed tectonic inversion in the southern Changling Depression supply trap conditions, which present good fluid transporting conditions and multi-period hydrocarbon accumulation showing great potential for oil and gas exploration.
Key words:  natural gas origin  oil-source correlation  condensate  K1sh Formation  Changling Depression  Songliao Basin