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千米桥潜山奥陶系的储集类型主要有孔洞型、裂缝型、孔洞缝复合型和孔隙型 4类 ,其中以孔洞缝复合型为主要储集空间 ,最有利于油气的运聚。储层的分布具有纵向上分带、平面上分区的特点。在纵向上划分的 4个带中 ,以第 2、3带储集性能为好 ,是油气主要的聚集带。在平面上的残丘区和凹槽区中 ,以残丘区岩溶作用强度大、保存条件有利 ,储层最为发育。溶蚀孔洞的形成受控于岩性、水性质、构造运动及古气候、裂缝等因素 ,主要形成于加里东早海西岩溶期 ;构造裂缝的形成受控于构造运动、岩性、构造位置及埋深 ,主要形成期是印支和早燕山期。印支早燕山运动对奥陶系储层的改造作用主要表现为产生大量裂缝、再次溶蚀、产生新的孔洞 ;中晚燕山运动主要表现为严重的充填作用 ,喜山运动则使孔洞缝有进一步减少的趋势。
There are four types of reservoirs of Ordovician in Qianmiqiao buried hill: vuggy type, fracture type, hole-hole composite type and pore type. Among them, the pore-seam composite type is the main reservoir space, which is most conducive to the migration and accumulation of oil and gas. The distribution of reservoirs has the characteristics of longitudinal zoning and plane division. Among the four zones divided in the vertical direction, the reservoirs of zones 2 and 3 are better, which is the main accumulation zone of oil and gas. In the area of the remaining hills and valleys in the plane, the karstification intensity in the residual hill area is large, the preservation conditions are favorable and the reservoir is the most developed. The formation of dissolution pores is controlled by factors such as lithology, water property, tectonic movement, paleoclimate, and fractures, and mainly formed in the Caledonian Early Hercynian karst period. The formation of tectonic fractures is controlled by the tectonic movement, lithology, structural location and Buried depth, the main formation period is Indosinian and early Yanshan period. Early Indosinian Yanshan movement on the Ordovician reservoir modification mainly due to produce a large number of cracks, re-erosion, resulting in new holes; late Yanshan movement mainly for the filling of the role of the Himalayan movement is to make the hole even further Reduce the trend.