四川盆地油气保存与破坏的地质研究  

GEOLOGICAL RESEARCH ON OIL-GAS PRESERVATION AND DESTRUCTION IN SICHUAN BASIN

作　　者：杨家琦[1] 周建文[1] 

机构地区：[1]四川石油管理局地质勘探开发研究院

出　　处：《天然气工业》1996年第S1期79-92,109-110,共16页Natural Gas Industry

摘　　要：文章据大量的勘探和样品实验资料，从成藏的封闭机理出发，探讨了四川盆地的盖层、水文地质条件、断层对油气保存与破坏的控制作用；建立了多重生储盖组合非均质气藏天然气扩散、盖层渗漏散失的动态评价、水化学保存条件定量评价、水文地质垂直分带预测、碳酸盐岩缝洞系统的断层保存条件评价及预测等模型；提出了盖层的厚度对气扩散和渗漏的动态封堵具有重要作用的观点及盖层的综合遮挡系数、三维荧光指纹图形、水化学特征指数、断层保存系数等新概念；推出了封闭式实验非稳态法求解岩石扩散系数的新方法，既纠正了通常采用的稳态法存在的严重偏差，且极大地缩短了实验时间，提高了功效。通过计算和综合研究，首次实现了四川盆地下二叠统、上三叠统气藏保存条件定性和定量的评价，进而提出了５个有利于形成大中型气田的区块和几十个未钻构造的勘探目标。Based on a lot of exploration and sample experimental data and startedfrom reservoir-formed seal mechamism, the control effects of caprocks,hydrogeologic conditions and faults on oil-gas preservation and destruction in Sichuan Basin are disscussed. Themodes of natural gas diffusion from heterogeneous gas reservoir with multiple source-reservoir-caprock assemblage, dynamic evaluation of the loss through leakage from caprocks,quantitative evaluation of hydrochemistry preservative conditions, hydrogeologic verticalzoning prediction, fault preservative evaluation of carbonate rock fracture-cavity system areset up. The viewpoint which the caprock thickness has important effect on gas diffusion andleakage dynamic sealing and the new concepts such as caprock comprehensive barrier coefficient, 3-D fluorescence fingerprint graph, hydrochemistry characteristic index, fault preservation coefficient etc. are proposed out. A new way of finding the solution of rock diffusioncoefficient by closed experiment unstable state method is inferred and it can not only correctthe serious deviation by stable state method but also largely shorten experiment time andraise efficiency. Through calculating and comprehensively researching, it is firstly realizedqualitatively and quantitatively evaluating gas reservoir preservative conditions of Lower Permian and Upper Triassic in Sichuan Basin, furthermore, 5 blocks favourable to forminglarge-medium gas field and several tens of undrilled structures as exploration targets are proposed out.

关 键 词：四川盆地 油气藏 保存 扩散 渗漏 水文地质学 定量分析 

分 类 号：TE122[石油与天然气工程—油气勘探]