马朗凹陷下二叠统风化壳特征与油气成藏关系

对三塘湖盆地马朗凹陷下二叠统卡拉岗组风化壳特征进行了分析,并将该古风化壳在纵向上划分为风化粘土层、强风化碎石层、弱风化块石层以及未风化岩石层等层段。剖析了该风化壳形成的地质条件和构造演化特征,探讨了可能发育油气藏类型及与风化壳的关系,并指出了该区下一步下二叠统卡拉岗组风化壳有利的勘探目标是在下二叠统条湖组剥蚀线与下二叠统卡拉岗组剥蚀线之间范围内,其次为卡拉岗组剥蚀线以东地区。

Relationship between Weathering Crust Characteristics and Hydrocarbon Accumulation of Lower Permian in Malang Sag, Santanghu Basin

The weathering crust of Kalagang formation of Lower Permian in Malong sag, Santanghu basin is characterized by vertical weathered clay layer, highly weathered detritus, weakly weathered block layer and non-weathering rock interval. This paper analyzes the geologic conditions of the weathering crust formation and structural evolution feature, and then discusses the relationship between the weathering crust and the possible reservoir types. It is concluded that the favorable targets for petroleum exploration are in areas within denudation lines between the Tiaohu formation and Kalagang formation as well as area in east of denudation line of Kalagang formation.