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震旦纪高石梯构造位于四川盆地绵竹—长宁克拉通内裂陷东侧的台地边缘带,发育藻灰泥丘、砂屑滩及云坪,同时受震旦纪末期桐湾Ⅱ幕构造运动的抬升暴露剥蚀并形成岩溶风化壳。灯四段为溶蚀孔洞型白云岩储层,主要储集空间有溶洞、溶孔及晶间孔。在岩心、成像测井和常规测井对溶蚀孔洞型储层的定量判识基础上,划分洞穴型、孔洞型、孔隙型、裂缝—孔洞型、裂缝—孔隙型和裂缝型6类储集空间。在纵向上,根据储集空间类型及其组合特征提出洞穴—孔洞型、裂缝—孔洞型、孔洞型、裂缝—孔隙型、裂缝型5类储层组合模式。其中洞穴—孔洞型、裂缝—孔洞型为高产长期稳产型,是最好的储层组合类型;孔洞型为中产长期稳产型;裂缝—孔隙型和裂缝型则为高产短期稳产型。
The Sinian high stone staircase is located in the margin of the platform on the eastern side of the craton - Changning craton in the Sichuan Basin. Algae plaster mounds, sandy littorals and clouds are developed. At the same time, Raise exposed denudation and form a karst weathered crust. The four sections of the lamp are eroded porous dolomite reservoirs, with the main reservoir space being caverns, dissolved pores and intercrystalline pores. On the basis of the quantitative identification of dissolved pore reservoirs by core logging, imaging logging and conventional logging, this paper divides 6 types of reservoir space: cave type, pore type, pore type, fracture-pore type, fracture-pore type and fracture type . In the vertical direction, according to the type of reservoir space and its combination characteristics, a combination of five types of reservoir models is proposed: cave-hole type, fracture-hole type, hole type, fracture-pore type and fracture type. Among them, the cave-hole type and fracture-hole type are the high-yield long-term and stable-yield type, which is the best type of reservoir combination. The hole type is middle-class and long-term stable production type while the fracture-pore type and fracture type are the high-yield short-term stable production type.