川中高石梯-磨溪地区中二叠统栖霞组气水分布特征及主控因素  

Gas-water distribution and its controlling factors in Middle Permian Qixia Formation,Gaoshiti-Moxi area,central Sichuan Basin

作　　者：任丽梅[1] 唐松[1] 王伟[2] 梁家驹[2] 徐平生 李昱翰 曾思逊 Ren Limei;Tang Song;Wang Wei;Liang Jiaju;Xu Pingsheng;Li Yuhan;Zeng Sixun(Central Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Suining,Sichuan 629001,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]中国石油西南油气田公司川中油气矿 [2]油气藏地质及开发工程国家重点实验室成都理工大学

出　　处：《天然气勘探与开发》2022年第3期24-33,共10页Natural Gas Exploration and Development

摘　　要：高石梯—磨溪地区是四川盆地中部重要的天然气产区,近年来中二叠统栖霞组勘探获得重大突破,多口探井测试获得高产工业气流,是继上震旦统龙王庙组和下寒武统灯影组之后的又一重要产层。栖霞组气藏单井测试产量差异大,存在低部位产气,高部位产水的现象,气藏不具有统一气水界面,气水关系复杂,气水分布不严格受现今构造控制,表现为构造—岩性气藏。通过对MX117井流体包裹体分析结果表明,栖霞组经历了三期油气充注:第1期液态烃包裹体,温度110~120℃,中—晚三叠世,发育古油藏;第2期,油+少量气包裹体,温度130~140℃,早—中侏罗世,发育古油气藏;第3期,油裂解气+气烃包裹体,温度160~170℃,中—晚侏罗世,发育古气藏。通过对成藏演化史、构造演化史的分析,栖霞组气水分布受油气成藏期古构造和现今构造的共同控制,在古今构造叠合区,构造高部位以气层为主,构造低部位气水层均发育;而对于古今构造迁移区,成藏期古构造具有明显的控制作用,古构造相对高部位栖霞组普遍发育气层,测试获高产工业气流。该研究成果对栖霞组气藏下一步的勘探开发决策具有一定的指导意义。In Gaoshiti-Moxi area,an important gas-producing area in central Sichuan Basin,major exploration breakthroughs on the Middle Permian Qixia Formation have been made along with high-yield industrial gas flow in several exploration wells in recent years.This makes the Qixia Formation as another critical target followed by Longwangmiao Formation and Dengying Formation.However,most reservoirs of Qixia Formation present great variation in single-well productivity during test,and gas produced at structural low and water at structural high.Moreover,due to no uniform gas-water contact,these reservoirs are featured by complex gas-water rela-tionship with the gas-water distribution not strictly subject to current structure.Thus,they are deemed as structural-lithologic ones.After an analysis of fluid inclusion in MX117 well,it is shown that the Qixia Formation experienced three stages of hydrocarbon charging,such as(1)first stage:liquid hydrocarbon inclusion,at 110–120℃,in the Middle to Late Triassic,forming ancient oil reser-voirs,(2)second stage:oil+minor gas inclusion,at 130–140℃,in the Early to Middle Jurassic,forming ancient oil and gas reservoir,and(3)third stage:oil cracking gas+gas hydrocarbon inclusion,at 160–170℃,in the Middle to Late Jurassic,forming ancient gas reservoirs.According to some analysis on reservoir-forming and structural evolution history,it is found that the distribution of gas and water in Qixia Formation is controlled by both ancient structure in reservoir-forming period and current structure.In the area where ancient and current structures are superimposed,the structural high is dominated by gas layers,while the structural low contains both gas and water layers.In the area where ancient and current structures are migrated,the ancient structure in reservoir-forming period has an obvious control.Therefore,gas layers are extensively developed in the Qixia Formation at relatively high ancient structure,and reveal high-yield industrial gas flow.These results are of guiding significance to

关 键 词：四川盆地 中二叠统 栖霞组 气水分布 古今构造 成藏演化 

分 类 号：P618.13[天文地球—矿床学]