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基于气藏开发地质特征,利用核磁共振、恒速压汞、薄片鉴定、相渗实验及岩心衰竭式开采物理模拟实验等手段,将川西地区致密砂岩气藏的开发可划分为3种主要类型:1多层叠置毯状致密砂岩气藏以砂体横向展布稳定,纵向叠置程度高,原始束缚水饱和度较高为地质特征,形成了以直井分层压裂多层合采、提高储量动用程度,水平井加砂压裂、提高单井产能及泡沫排水采气为主的开发模式;2多层叠置条带状致密砂岩气藏以砂体规模小、厚度薄为地质特征,形成了多层合采与层间上返挖潜、提高单井可采储量,开发后期增压开采与高低压分输为主的开发模式;3砂泥薄互层毯状致密砂岩气藏以多个薄砂体交互叠置状或透镜状分布为地质特征,形成了滚动开发评价、降低开发风险,多层合采、转层挖潜、增压开采与泡沫排水采气为主的开发模式。
Based on the geological characteristics of gas reservoir development, the development of tight sandstone gas reservoirs in western Sichuan can be divided into three main types based on the methods of nuclear magnetic resonance, constant pressure mercury intrusion, sheet identification, phase permeability test and core failure type physical simulation. 1 Multi-layered blanket-shaped tight sandstone gas reservoirs are characterized by stable horizontal distribution of sand bodies, high degree of vertical stacking and high original irreducible water saturation as geological features, forming multi-layered combined production by stratified fracturing of vertical wells to increase reserves Utilization level, horizontal well sand fracturing, single well productivity improvement and foam drainage and gas recovery. The multi-layered strip-shaped tight sandstone gas reservoirs are characterized by small sand bodies and thin thickness as geological features Multi-layer co-mining and back-up between the layers to tap the potential to improve the single-well recoverable reserves, the development of late pressure booster mining and high-pressure distribution-based development model; 3 sand and thin interbedded blanket tight sandstone gas reservoir with thin Sandstone overlap or lens-like distribution of geological characteristics of the formation of a rolling development evaluation, reduce development risk, multi-layered mining, turnaround potential, supercharged mining and foam drainage gas-based development model.