松辽盆地红岗地区下白垩统储层沉积与隐蔽油气圈闭预测

对松辽盆地红岗地区中部含油组合的储层沉积学研究表明:研究区砂岩类型以长石砂岩为主,成熟度低,分选好-中等,磨圆中-差,杂基含量低;沉积构造类型多样,准同生变形构造十分发育;自西向东依次出现(扇)三角洲/浅湖、半深湖、深湖沉积,可划分为三种沉积体系,有利沉积相为(扇)三角洲前缘及浊积岩;成岩作用较弱,次生孔隙发育,属中孔中-低渗型储层。笔者应用对储层沉积学的研究成果进行了隐蔽油气圈闭识别,指出了研究区隐蔽圈闭类型及其在平面上和纵向上的分布规律。

Reservoir sedimentology and prediction of the Lower Cretaceous subtle hydrocarbon traps in the Honggang region,Songliao Basin

The study of reservoir sedimentology shows that the feldspar sandstone as a main type of sandstones developed in the central part of the Honggang region, Songliao Basin is characterized by low maturity, well to moderate sorting, moderate to poor roundness and low matrix contents. Sedimentary structures and penecontemporaneous deformation vary greatly. There occur from west to east the （fan） delta or shallow, semi-deep and deep lacustrine deposits which are assigned to three depositional systems. The favourable sedimentary facies consists of （fan） delta front deposits and turbidites. The sandstone reservoirs have moderate porosity, and moderate to low permeability due to weak diagenesis and well-developed secondary porosity. The results of research in reservoir sedimentology have been applied to the recognition and prediction of the Lower Cretaceous subtle hydrocarbon traps in the Honggang region, Songliao Basin.