四川盆地磨溪区块龙王庙组气藏流体分布控制因素

发布时间：2018-06-08 01:25

本文选题：磨溪地区 + 龙王庙组　；参考：《地质与勘探》2017年03期

【摘要】：随着勘探开发的深入,对四川盆地磨溪龙王庙组气藏流体分布的认识发生变化,由早期的无水气藏或无边底水气藏转变为存在边底水、局部封存水,表现出复杂的气水关系,这制约了气藏的高效开发。为此,本次研究综合现有录井、岩心、测井、地震、测试及生产资料,识别出溶蚀孔洞发育区,在此基础上,采用印模法恢复研究区龙王庙组古地貌格局,结合现今构造特征,综合分析认为:(1)油气分布既受现今构造圈闭控制,又受有利岩相控制,也受古地貌影响;(2)古地貌控制了早期油气聚集,在地势较高的缓坡区聚集油气,在局部洼陷区滞留地层水,在地势变陡的低部位形成富水区;(3)在现今构造圈闭范围内,由于物性、闭合度和海拔高差存在差异,导致东、西部井区含气性不同,西区富气程度优于东区;(4)结合古今构造格局,在古地貌地势低部位(地势低于-300m)、现今构造低部位(海拔低于-4385m)广泛分布边水;(5)当古地貌地势低于-300m时,在现今构造和古地貌相对凸起部位存在局部油气聚集。
[Abstract]:With the development of exploration and development, the understanding of fluid distribution in the gas reservoir of the Longwangmiao formation in Moxi, Sichuan Basin has changed from the early anhydrous gas reservoir or the boundless bottom water gas reservoir to the existing edge bottom water reservoir, which shows a complex gas-water relationship. This restricts the high efficiency development of gas reservoir. Therefore, this study synthesizes the existing logging, core, logging, seismic, testing and production materials, and identifies the developed area of dissolved holes. On this basis, the paleogeomorphological pattern of Longwangmiao formation in the study area is restored by imprinting method, combining with the present structural characteristics. The comprehensive analysis shows that the oil and gas distribution is controlled not only by the present tectonic traps, but also by the favorable lithofacies and the paleogeomorphology) the early oil and gas accumulation was controlled by paleogeomorphology, and oil and gas were accumulated in the gentle slope areas with high topography. In the area of present tectonic traps, due to the differences in physical properties, closure and elevation, the gas-bearing properties in the eastern and western well areas are different, due to the formation water retention in the local sag areas and the formation of water-rich areas in the lower parts of the steepening terrain. The natural gas abundance in the western region is better than that in the eastern region, combining with the paleogeomorphological pattern. When the paleogeomorphic topography is lower than -300mg (topography is lower than -300mg), the lower part of the structure (altitude is lower than -4385m) is widely distributed, when the paleogeomorphology topography is lower than -300m, Local oil and gas accumulation exists in the relative uplift of present structure and paleogeomorphology.
【作者单位】：中国石油西南油气田公司勘探开发研究院;
【基金】：国家科技重大专项(编号:2016ZX05052)资助
【分类号】：P618.13

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