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ABSTRACT: Recognition of petroleum fluid mixing in carrier beds and reservoirs using age-specific biomarker approach

Li, Maowen1, Lloyd R. Snowdon1, Renzi Lin2, Peirong Wang3, Zhongyao Xiao4, Shuichang Zhang5, and Digang Liang5
(1) Geological Survey of Canada, Calgary, AB
(2) China Petroleum University, Beijing, China
(3) Jianghan Petroleum University, Hubei, China
(4) Tarim Petroleum Exploration Bureau, Kuerle, China
(5) Research Institute of Petroleum Exploration and Development, CNPC, Beijing, China

Petroleum fluid mixing in carrier and reservoir system is common in sedimentary basins that contain multiple petroleum source sequences with a long, complex tectonic history. Tarim Basin in NW China is such an example. The presence of over 10,000 meters of Precambrian - Cenozoic sediments bounded by six major unconformities in this basin is clearly favorable for multiple stages of petroleum fluid generation, migration, redistribution and mixing. Consequently, recognition of the mixing effects holds the key for meaningful oil-source and gas-source correlation in this basin. This paper presents three case studies in the Tarim Basin, in which we combine age-specific biomarkers, gas isotope data and basin modeling approaches to delineate (1) the mixing of oil-gas-carrier bed organic matter in the Kekeya field, (2) normal black oil-heavily biodegraded oil mixing in the Tazhong region and (3) high maturity oil-low maturity reservoir bitumen mixing in the eastern segment of the Southwest Depression.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia