东营凹陷民丰地区沙河街组四段—三段中亚段沉积相与沉积演化特征

doi:10.11743/ogg20120214

Abstract

Abstract:

No consensus has been reached on the types of sandy conglomerate fans in the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area.Based on observation and description of cores from 26 wells and in combination with seismic data,logging data,and grain size characteristics,this paper systematically studied the sedimentary characteristics of sandy conglomerate fans,including nearshore subaqueous fans,fan deltas and deep water turbidite fans in the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area.Fan deltas dominate the bottom of the lower 4^th member and middle 3^rd member of Shahejie Formation,while the nearshore subaqueous fans are predominant in the middle to upper part of the lower 4^th member,the upper 4^th member and the lower 3^rd member of Shahejie Formation.Deep water turbidite fans exist in each interval,but their scales are small.On the basis of identifying the types of sandy conglomerate fans in different intervals,we analyzed the synsedimentary tectonic activity,the geometry of boundary fault,paleoclimate,water depth and the close and open of lake basin,and determined the evolution and distribution characteristics of the main sedimentary facies in different periods. Based on these studies,this paper puts forward a sedimentary evolution model for the sandy conglomerate fans in the steep-slope zone of rifted lacustrine basin under the successive controls of the'high angle plate fault-high angle listric fault’,offering an appliccable instruction for oil and gas exploration in similar area.

Key words: fault, sandy conglomerate fan, sedimentary facies, sedimentary evolution, Minfeng area, Dongying Sag

CLC Number:

TE121.3

Yuan Guanghui, Cao Yingchang, Wang Yanzhong. Sedimentary facies and their evolution of the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area, Dongying Sag[J]. Oil & Gas Geology, 2012, 33(2): 277-286.

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Sedimentary facies and their evolution of the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area, Dongying Sag

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Sedimentary facies and their evolution of the 4th-middle 3rd members of Shahejie Formation in Minfeng area, Dongying Sag

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Sedimentary facies and their evolution of the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area, Dongying Sag