川西坳陷中部上三叠统烃源岩动态演化模拟

doi:10.11743/ogg20120408

Abstract

Abstract:

The Upper Triassic source rocks in the central of western Sichuan Depression got mature during the deposition of the 3^rd member of Xujiahe Formation,over-mature stag in the late of Early Jurassic and post-mature in the Late Jurassic.The EW-dipping tectonic framework in western Sichuan depression determines that the source rocks in the west got mature earlier and have higher maturity than that in the east.Area with high maturity was near the piedmont of Longmen Mountain at the end of deposition of the 3^rd member of Xujiahe Formation,and it extended eastwards with the highest maturity migrating near to Longshen-1 well at the end of deposition of the 5^th member of Xujiahe Formation.Later it migrated eastwards as a whole at the end of the Jurassic.The area with high maturity has centered in Mianyang-Deyang-Pengzhou-Dayu from the Creataceous to present,with the highest maturity occurring at Mashen-1 well and Dayu North.The whole amount of gas generated from source rocks in the Xujiahe Formation in western Sichuan depression is 167.812 5 tcm.The gas generated during the deposition of the Maantang Formation-3^rd member of Xujiahe Formation accounts for 2.53% of the total,that during the deposition of 4^th and 5^th members of Xujiahe Formation accounts for 10.84%,that in the Early and Middle Jurassic 22.97%,that in the Later Jurassic 22.86% and that in the Early Cretaceous 40.97%.

Key words: dynamic evolution, basin modeling, source rock, Xujiahe Formation, western Sichuan Depression

CLC Number:

TE112.3

Jiang Xingge, Zeng Huasheng, Zhu Jianhui, Cao Qian. Dynamic evolution simulation of the Upper Triassic source rocks in central part of western Sichuan Depression[J]. Oil & Gas Geology, 2012, 33(4): 545-551.

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Dynamic evolution simulation of the Upper Triassic source rocks in central part of western Sichuan Depression

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