The sectional evolution characteristics of Cambrian platform margin in Manxi area of Tarim Basin and its differences in source-reservoir-cap combination conditions

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  • 1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.SINOPEC Management Institute,Beijing 100012,China;
    3.PetroChina Daqing Oilfield Company,Daqing 163712,China

Received date: 2018-02-24

  Revised date: 2018-05-31

  Online published: 2018-08-29

Abstract

Manxi platform margin is located in the western edge of the Manjiaer Depression,Tarim Basin.It has been a large carbonate platform margin since Cambrian-Ordovician.In recent years,rich oil and gas shows have been found in the wells drilled in the platform margin.However,up to now,no exploration breakthrough has been achieved.The reason for this is that the reservoir-cap combination conditions are unclear which restricts the success of oil and gas exploration.In this paper,by analyzing the characteristics of seismic reflection structures and seismic stacking patterns,the Cambrian platform margin in Manxi is divided into 3 segments,and a sectional sedimentary evolution analysis is performed.It is pointed out that the differential tectonic subsidence and relative sea level changes are the major factors controlling the differential evolution of the platform margin.Based on the analysis of the differential sedimentary evolution of the platform margin,the differences of the source-reservoir-cap combination conditions in the different segment of the platform margin are discussed.It is pointed out that the Lower Cambrian gentle slope beach covered by occult dolomite in Lunnan area is the most favorable exploration target.The upper Cambrian platform margin reef bank covered by tight limestone in Gucheng area is the second,which is a more favorable prospecting target.This study provides beneficial geological supports for the oil and gas exploration in Manxi area.

Cite this article

Cao Ying-hui, Li Hong-hui, Yan Lei, Wang Hong-jiang, Zhang Jun-long, Yang Min, Zhao Yi-min . The sectional evolution characteristics of Cambrian platform margin in Manxi area of Tarim Basin and its differences in source-reservoir-cap combination conditions[J]. Natural Gas Geoscience, 2018 , 29(6) : 796 -806 . DOI: 10.11764/j.issn.1672-1926.2018.05.021

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