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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。
According to the actual situation in the development of the geo-history of Lei-1 transitional zone in the central Sichuan-Sichuan transitional zone, the first is to use the compaction numerical simulation method to reconstruct the burial history of the Lei-1 sub-segment (palaeostructure, palaeo-sedimentation, evolution history of porosity, etc.) ). Secondly, the ancient hydrodynamic field numerical simulation method was used to recover the paleo-hydrodynamic field of the aquifer in each section of Lei-1 sub-section. Based on this, the collocations between paleocurrents and palaeotectonic evolution were studied , Revealing the rule of migration and accumulation of natural gas in the region of Lei-1 sub-region. The results show that the Lei-1 sub-region in the area has been in the low water potential area of the northern slope of Gulong uplift in the history of the earth’s history, and is the over-current zone where the groundwater pool. The Anyue-Moxi Gulong nose The trend of the axis is basically perpendicular to the flow of formation water, which is beneficial to the collection of water-soluble gas and free gas from the water. The analysis of the contour map shows that the study area has the characteristics of gas pool formation during the Cretaceous-Early Tertiary Favorable conditions. At the same time, combined with the present hydrogeological conditions analysis and the structural parameters of the roar and throat reservoirs, we make an assessment of the trap types in the favorable areas in the area.