洛带气田遂宁组致密储层的快速产能评价

Quick Evaluation on Productivity of Compacted Clastic Reservoir in Suining Formation of Luodai Gas Field

洛带气田遂宁组为岩性圈闭气藏,储层为低孔隙度、低渗透率致密砂岩,以孔隙型储层为主,部分发育微裂缝。分析了其产能与储层参数及钻井走向的关系,认为泥质含量、孔隙度、渗透率、饱和度、储层有效厚度以及微裂缝发育等储层参数对其产能有较大影响;走向垂直于其构造长轴的定向井产能较高。该地区常规测井识别微裂缝发育的标志可归纳为微球电阻率测量值明显低于双侧向电阻率测量值。通过回归分析建立了其储层参数与产能的拟合关系式,其估算值与测试结果吻合,可用于遂宁组储层产能的快速估算。

Suining Formation （J3sn） of Luodai Gas Field is a lithology trap gas reservoir. Its gas-bearing intervals are characterized by tight sandstone with poor porosity and poor permeability, and majority of them are of porous-type and minority are of microfracture. Having analyzed the relationship between its productivity and reservoir parameters as well as direction of well drilling, it is believed that its productivity is influenced primarily by several parameters of the reservoir, such as shale content, porosity, permeability, saturation, effective thickness and microfracture. The productivity of directional wells with direction perpendicular to the long axis of the structure is higher. Local recognition criterion of matured microfracture of the reservoir with conventional loggings could be summarized as that its microspherically focused resisitivity is remarkably lower than the dual laterolog resisitivity. Fitting relational formula of productivity and parameters of the reservoir is established by regression analysis. Its estimation for productivity is accordant with the test, and can be used in quick evaluation of productivity of Suining Formation.