柯坪露头区柯坪塔格组河流作用为主的三角洲沉积特征及其油气勘探意义

doi:10.11743/ogg20120208

Abstract

Abstract:

The Silurian marine clastic reservoir in Tarim Basin is an important exploration play,in which some exploration breakthrough has been made in Central Tarim and North Tarim.However,no consensus has been reached about its sedimentary environment and characteristics,influencing future exploration.Based on the outcrop research and microscopic analysis of thin sections,this paper reveals that the Kepingtage Formation(Fm)in the Keping outcrop area can be divided into three third-order sequences.Large-scale fluvial-dominated delta deposits(mainly delta front and pro-delta deposits)are recognized in the Kepingtage Fm.Further more,several microfacies such as underwater distributary channel,inter-branch channel bay,mouth bar,distal bar and pro-delta mudstone are identified.The existence of large incised channel on the lower boundary of sequence indicates that large-scale deep water turbidite sandbody may develop in deep water.This delta deposits combination in the study area is of great significance for petroleum exploration in the Silurian marine clastic reservoirs in Tarim Basin.Favorable source rock conditions,large sandbody and multiple reservoir-source rock combinations are favorable for hydrocarbon accumulation.The turbidite sandbodies possibly developed in the deep water area are also the potential exploration targets.

Key words: delta, sedimentary feature, Kepingtage Formation, Keping area, Tarim Basin

CLC Number:

TE121

Bai ZhenRui, Xing Fengcun, Li Huixian. Sedimentary features of fluvial-dominated delta in the Kepingtage Fm in Keping outcrop area and their significance for petroleum exploration[J]. Oil & Gas Geology, 2012, 33(2): 217-224.

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Sedimentary features of fluvial-dominated delta in the Kepingtage Fm in Keping outcrop area and their significance for petroleum exploration

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