川东南志留系石牛栏组生物礁特征与勘探方向

摘要/Abstract

摘要： 通过对野外剖面、钻井资料及地震资料详细分析，明确了川东南地区志留系石牛栏组沉积期为一向北倾斜的大型缓坡，由南向北可分为内缓坡、中缓坡及外缓坡—陆棚。其中石牛栏组二段中缓坡相带发育，水体清澈，能量较高，发育礁滩相碳酸盐岩沉积。岩性主要为介壳灰岩、珊瑚灰岩及生屑灰岩等，地震上生物礁滩表现为地层增厚、“亮点”反射等特征，平面上主要沿叙永—西门1井—温水—隆盛2井呈北东向带状分布。元厚—四面山一带位于生物礁滩主体带，微古地貌较高，极可能发育礁滩相白云岩储层，是石牛栏组油气勘探有利方向。

关键词: 生物礁滩, 石牛栏组, 勘探方向, 川东南

Abstract: Analysis on field outcrops, well data and seismic data clarifies that the Silurian Shiniulan Formation in southeastern Sichuan Basin presents as a large north-dipping gentle slope, which can be divided to (from south to north) inner gentle slope, central gentle slope and outer gentle slope-continental shelf. The second member of Shiniulan Formation (Shi 2 Member) contains central gentle slope facies belt, with clean water and high energy, and it is composed of reef-beach carbonate deposits. The lithology is mainly of shell limestone, coral limestone and bioclastic limestone. Reef beach is characterized by thickened strata and “bright spot” on seismic profile and represents NE-trending ribbon-pattern distribution along the Xuyong-Well Ximen 1-Wenshui-Well Longsheng 2 in plane. The Yuanhou-Simianshan area is located in the main part of reef-beach zone, with high micro-geomorphology, where the reef-beach dolomite reservoirs are probably developed, suggesting as the favorable exploration prospect of the Shiniulan Formation.

Key words: reef beach, Shiniulan Formation, exploration orientation, southeastern Sichuan Basin

王海军, 孟宪武, 梁子锐, 李兴平. 川东南志留系石牛栏组生物礁特征与勘探方向[J]. 中国石油勘探, 2016, 21(5): 33-41.

Wang Haijun, Meng Xianwu, Liang Zirui, Li Xingping. Organic reef characteristics and exploration orientation of Silurian Shiniulan Formation, southeastern Sichuan Basin[J]. China Petroleum Exploration, 2016, 21(5): 33-41.

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