摘要
根据川中－川南过渡带雷一１亚段在地史发展中的实际情况，一是采用压实数值模拟方法，重建雷一１亚段的埋藏史（古构造、古沉降、孔隙度演化史等），二是用古水动力场数值模拟方法，恢复雷一１亚段的含水层在各时期的古水动力场，并以此为基础研究古流体势场和古构造演化之间的搭配关系，揭示了区内雷一１亚段在地史中天然气的运聚规律。研究结果表明：区内雷一１亚段在地史发展中一直处于沪州古隆起北斜坡的低水势区，是地下水汇集的过流带，燕山期形成的安岳－磨溪古隆鼻的轴线走向基本垂直于地层水流向，这对水溶气的汇集和游离气从水中脱出是有利的，结合气势等值线图的分析，反映出研究区在白垩纪－早第三纪具有形成气藏的有利条件。同时，结合现今水文地质条件分析和储层吼喉结构分数等资料，对区内有利地带的成藏圈闭类型作出了评价。
Based on the actual situation of Tr11 in Chuanzhong-Chuannan intermediate zone in geological history, the burial history (including palaeostructure, palaeo-subsidence, porosity evolution history etc)of Tr11 is rebuilded by compaction numerical modelling method. Then,the palaeo-hydrodynamic field of Tr11 water-bearing bed at each stage is resumed by numerical modelling of palaeo-hydrodynamic field. The match relationship between palaeo-flow potential field and palaeostructure evolution is researched. The gas migration-accumulation law of Tr11 in geological history is revealed. Research result indicates 7that the Tr11 is in the low water-potential region of Luzhou palaeohigh north slope in geological history and it is in the intermediate zone of underground water accumulation. The axial of Anyue-Moxi palacohigh nose formed in Yanshan period is nearly vertical with the direction of formation water flow,which is available for water-soluble gas accumulation and the the escape of free gas from water. By analysing contour line diagram,present hydrologic geology conditions and the parameters of reservoir pore throat texture,it is discovered that K (K1-z)-E is of favourable conditions of forming gas pool and the types of reservoir-forming trap in beneficial areas are evaluated.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1994年第4期13-18,共6页
Natural Gas Industry
关键词
中三叠世
水文地质
油气运移
圈闭
entre south part of Sichuan, Middle Triassic, hydrologic geology, hydrocarbon migration and accumulation, trap types.
