--> Hydrocarbon Generation and Expulsion Features of the Upper Triassic Xujiahe Formation Source Rocks and Their Controlling Effects on Hydrocarbon Accumulation, Sichuan Basin, Central China
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2018 AAPG International Conference and Exhibition

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Previous HitHydrocarbonNext Hit Generation and Previous HitExpulsionNext Hit Features of the Upper Triassic Xujiahe Formation Source Rocks and Their Controlling Effects on Previous HitHydrocarbonNext Hit Previous HitAccumulationNext Hit, Sichuan Basin, Central China

Tianyu Zheng1


1China University of Petroleum-Beijing, Beijing, China.


November 4-11, 2018 – 2018 AAPG International Conference and Exhibition, Cape Town, South Africa

Posted: March 26, 2019

Abstract

The quantitative study of Previous HithydrocarbonNext Hit generation and Previous HitexpulsionNext Hit of the Upper Triassic Xujiahe Formation (T3x) in Sichuan Basin is relatively weak. As yet, exploration for favorable exploration zones in T3x in Sichuan Basin has been less than satisfying to petroleum prospectors. According to the principle of mass balance, the Previous HithydrocarbonNext Hit generation and Previous HitexpulsionNext Hit of source rocks of the Xujiahe Formation are characterized with a novel method, Previous HithydrocarbonNext Hit generation potential index, using the pyrolysis data. The Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit threshold is determined to be Ro = 0.9% and the peak of Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit is determined to be Ro = 1.15%. The Previous HithydrocarbonNext Hit generation and Previous HitexpulsionNext Hit amounts of the Xujiahe Formation are 4525.5×10^8t and 2420.5×10^8t, respectively. Besides, there are three Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit centers identified of Xujiahe Formation in Sichuan Basin. According to the Previous HithydrocarbonNext Hit generation and Previous HitexpulsionNext Hit features of source rocks and distribution of oil and gas discovered, the Previous HithydrocarbonNext Hit Previous HitaccumulationNext Hit probability quantitative characterization model under the control of the Xujiahe Formation source rock is established using single factor regression analysis. After standardization, the intensity of Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit shows an exponential characteristic with the increase of Previous HithydrocarbonNext Hit Previous HitaccumulationNext Hit probability. And the distance of Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit has the characteristics of Gamma Distribution (A continuous probability function of statistics) along with the increase of Previous HithydrocarbonNext Hit Previous HitaccumulationNext Hit probability. Based on the above rules, a quantitative model of oil and gas Previous HitaccumulationNext Hit probability is established as follow: Fe=4.58Ls^(0.97)×e^(-Ls/0.46)+0.18Ls^(0.97)×e^[0.02qe-(Ls/0.46)]-0.04 (R^2 =0.95, n =41) (Where Fe is the probability of Previous HithydrocarbonNext Hit Previous HitaccumulationNext Hit, %;qe is the maximum Previous HithydrocarbonNext Hit Previous HitexpulsionNext Hit intensity, 10^6t / km^2. Ls is distance from Previous HithydrocarbonNext Hit reservoir to Previous HithydrocarbonNext Hit Previous HitexpulsionTop center after standardization, dimensionless.) Results show that the oil and gas favorable exploration areas in the Xujiahe Formation are distributed in the Qionglai, Chengdu, Deyang, as well as in west of Yilong regions. Production results show that 78% of discovered oil and gas are located in the predicted oil and gas favorable exploration areas and relatively favorable exploration areas.

AAPG Datapages/Search and Discovery Article #90332 © 2018 AAPG International Conference and Exhibition, Cape Town, South Africa, November 4-11, 2018