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综合分析川中侏罗系凉高山组含油和不含油典型井致密砂岩储集层物性、孔喉结构特征以及源储之间接触关系、储集层荧光照片等资料,研究凉高山组致密砂岩含油性控制因素。研究表明,川中地区侏罗系凉高山组致密砂岩的含油性受如下因素控制:①源储之间输导体系,烃源岩与砂岩储集层之间存在泥质含量高、物性较差的砂泥渐变段时,如无裂缝沟通,油气难以进入上覆储集层;②储集层物性,若砂体与烃源岩直接接触,且储集层物性较好,则油气可直接进入储集层成藏;③裂缝发育程度,储集层物性较差时,若裂缝发育则可改善储集层的孔渗条件,油气也可运移到储集层成藏,如储集层物性较差且无裂缝沟通,则油气难以进入储集层成藏。综合川中侏罗系凉高山组沉积特征、储集层特征以及烃源岩分布,优选出营山—广安和合川—白庙—罗渡2个有利勘探区带。
This paper analyzes the physical properties of the tight sandstone reservoirs in the oil-bearing and non-oil-rich wells in the Central Sichuan Jurassic Lianggao Shan Formation, the pore-throat structure characteristics, the contact relationship between source and reservoir and the photos of reservoirs, and studies the oil-bearing properties of the tight sandstone in Liangshan Formation Controlling factor. The results show that the oil-bearing properties of the tight sandstone in the Jurassic Liangshan Formation in the central Sichuan Basin are controlled by the following factors: ① There are high mud content and poor physical properties between the source and the reservoir, between the source rock and the sandstone reservoir In the graded section of sand and mud, if there is no crack communication, it is hard for oil and gas to enter the overlying reservoirs; ② Reservoir physical properties, if the sand body is in direct contact with the source rock and the reservoir physical properties are good, the oil and gas can directly enter the reservoir (3) When the degree of fracture development and reservoir properties are poor, if the fractures develop, the porosity and permeability conditions of the reservoir can be improved, and the oil and gas can also migrate into the reservoir. For example, the physical properties of the reservoir Poor and no crack communication, it is difficult for oil and gas to enter the reservoirs for reservoir formation. Based on the sedimentary characteristics, reservoir characteristics and source rock distribution of the Jurassic Liangshan Formation in the Central Sichuan Basin, two advantageous exploration zones, namely Yingshan-Guang’an and Hechuan-Baimiao-Luodu, are selected.