塔里木盆地不同类型斜坡带特征及其控油作用

斜坡带控制油气富集已被勘探实践所证实。塔里木盆地广泛发育的斜坡带按其成因特点可分为3类,即沉积期古斜坡、构造变动期古斜坡和保存期的斜坡。不同类型的斜坡带发育不同类型的油气藏,沉积期古斜坡主要为寒武纪—奥陶纪台缘斜坡带和志留纪—石炭纪超覆斜坡带,发育礁滩型油气藏和地层超覆型油气藏;构造变动期古斜坡主要为加里东—喜山期的构造枢纽带,发育奥陶系岩溶型油气藏和志留系—泥盆系地层上倾尖灭型油气藏;保存期斜坡带主要指现今构造斜坡,发育不同时期的构造-地层复合型油气藏。

Characteristics of different types of slope belt and its oil-control effect in Tarim Basin

Three genetic types of slope belt are identified in Tarim Basin, and they are paleoslopes respectively formed during the sedimentary period, structural deformation period and preservation period, where accordingly developed different reservoirs. The first type mainly refers to the Cambrian-Ordovician platform edge slopes and Silurian-Carboniferous overlapping slopes, where reef flat reservoir and stratigraphic overlap reservoir developed. The second type consists of Caledonian-Xishan tectonic hinge zone where Ordovician karst reservoir and Silurian-Devonian stratigraphic updip pinchout reservoir developed. The last type comprises the present tectonic slopes where tectonic-stratigraphic complex reservoirs of different stages developed.