红山油田白垩系清水河组储层特征及有利区带展望

红山油田白垩系清水河组为冲积扇入湖形成的扇三角洲沉积,从底到顶为一套完整的正旋回沉积,下部主要发育有砂砾岩、含砾砂岩、砂岩沉积,上部为厚层泥岩、泥质砂岩夹薄层砂岩沉积。薄片鉴定资料表明,储集体岩石类型主要为岩屑砂岩和长石质岩屑砂岩,其中以方解石、含铁白云石和菱铁矿胶结为主、杂基以泥质和蠕虫状高岭石为主。物性资料表明目标层段总体为中孔、中渗储层。清水河组储层以原生孔隙为主,次生孔隙为辅;原生孔隙中以原生粒间孔隙为主,而次生孔隙主要为溶蚀孔、晶间孔隙以及构造裂缝。从研究区沉积相带来看,K1q14至K1q11时期,水体逐步上升,砂体的展布范围逐步减小。综合以上的研究认识以及通过试油试采的验证,明确了该区有利砂体主要集中在K1q14和K1q13两个时期,这一研究成果将为下一步的开发部署提供重要的理论基础。

The reservoir characteristic and favorable zone outlook of The Cretaceous Qingshui He Formation in Hongshan Oilfield

The Cretaceous Qingshuihe Formation of Hongshan Oilfield is fan delta deposition formed by alluvial fan into the lake,which is a complete Positive cycle deposition from the bottom to the top ,the lower part mainly development conglomerate, pebbly sandstone and sandstone deposition, the upper part have thick mudstone and argillaceous sandstone with thin sandstone deposition.Slice identification data indicate that reservoir rock types are mainly lithic feldspathic sandstone and lithic sandstone, calcite, dolomite and siderite iron cement-based among them, miscellaneous base with mud and worm-like kaolinite. Physical data show the target layer is the reservoir of moderate porosity and medium permeability. The reservoir of Qingshuihe Formation mainly develops primary pore, the secondary pore are complementary. The primary intergranular porosity are main in the primary porosity, the secondary pore are mainly dissolved pore, intercrystalline pore and fracture. Analyzed from the Sedimentary facies of the study area, in the period of K1q14 to K1q11 , water gradually increased, the distribution range of sand body reduced gradually. Based on the Study and understanding above, we defined that the favorable sand body are mainly in the period of K1q14 and K1q13,the results of this study will provide important geological basis for the further evaluation and development..