四川盆地高石梯—磨溪地区灯四段岩溶古地貌恢复及地质意义

发布时间：2018-04-08 16:52

本文选题：古地貌　切入点：岩溶台面　出处：《石油勘探与开发》2017年01期

【摘要】：基于四川盆地高石梯—磨溪地区三维地震和钻孔资料,论证并选取龙王庙组顶—寒武系底界印模地震厚度来表征震旦系灯影组四段岩溶古地貌。灯四段岩溶古地貌可进一步划分为岩溶台面、斜坡和叠合斜坡3种地貌单元,且不同地貌单元具有不同的古水文条件,进而控制了岩溶作用强度和储集层质量差异。其中,叠合斜坡区域溶蚀作用最强,发育较大型的溶沟、溶洞系统,其储集空间主要为蜂窝状溶蚀孔洞,质量最好;台面斜坡溶蚀作用有所减弱,发育较小型的溶沟、溶洞系统,储集层质量相对变差;岩溶台面区域溶蚀作用最弱,主要发育小型花斑状岩溶系统,储集空间多为针孔—较小的溶蚀孔洞,整体质量相对较差,局部也存在质量较好储集体。结果表明,除高勘探程度的西部台缘带外,台内勘探程度较低的台面斜坡也可作为灯四段有利勘探区带。
[Abstract]:Based on the 3D seismic and borehole data in Gaoshitian-Moxi area of Sichuan Basin, the authors demonstrate and select the thickness of the upper Cambrian impression earthquake to characterize the karst paleogeomorphology of the fourth member of the Dengying formation of the Sinian system.The karst paleogeomorphology of the fourth section of the Landing formation can be further divided into three types of geomorphologic units: karst table, slope and superimposed slope, and different geomorphologic units have different paleohydrological conditions, which control the difference of karst action intensity and reservoir quality.Among them, the superimposed slope region has the strongest dissolution effect, and develops a large system of dissolution trenches and caverns, the storage space of which is mainly honeycomb cavities with the best quality, the dissolution of the table-surface slopes is weakened, and relatively small gullies are developed.In karst cave system, the quality of reservoir is relatively poor, the dissolution of karst Mesa is the weakest, and the small flower porphyry karst system is mainly developed. The reservoir space is mostly pinhole-small solution hole, and the whole quality is relatively poor.Part also has good quality storage collective.The results show that, in addition to the high exploration level of the western margin zone, the platform slope with low exploration degree can also be used as the favorable exploration zone of the fourth section of the lamp.
【作者单位】：西南石油大学;油气藏地质及开发工程国家重点实验室;中国石油碳酸盐岩储集层重点实验室沉积-成藏研究室;川庆钻探工程有限公司地质勘探开发研究院;中国石油西南油气田公司勘探事业部;中国石油西南油气田公司勘探开发研究院;
【基金】：“十三五”国家科技攻关项目(2016ZX05004002-001) 国家自然科学基金项目(41402126)
【分类号】：P618.13;P631.4

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