鄂尔多斯盆地上古生界输导体系与天然气运移关系浅析

发布时间：2018-08-23 10:07

【摘要】：本文以鄂尔多斯盆地上古生界的的区域地质资料为基础,通过岩心以及铸体薄片孔隙结构的观察,并且结合常规孔隙度和渗透率测定分析,对孔隙性砂岩及泥岩、裂缝性砂岩及泥岩以及断层的输导性能及其差异性进行了研究。在此基础上对盆地上古生界输导体系的类型进行了划分并对其分布进行了研究。与此同时,对鄂尔多斯盆地上古生界构造格局演化与油气运移特征进行了研究。主要取得了以下认识：(1)不同类型输导介质输导性能的研究在孔隙性砂、泥岩中,平行层面方向的连通性和渗透性一般优于垂直层面方向。在裂缝性砂、泥岩中,裂缝发育方向的渗透率要远远大于裂缝周围孔隙性砂、泥岩的渗透率。在塑性压实段,断层的输导性能一般较差,而在弹塑性压缩段和破裂段,断层的输导性能一般较好。(2)鄂尔多斯盆地上古生界输导体系分类在鄂尔多斯盆地上古生界地层中,天然气输导体系主要可以分为以孔隙为主的输导体系和以裂缝为主的输导体系,同时存在有少量的以断层为主的输导体系。(3)鄂尔多斯盆地上古生界输导体系分布特征在鄂尔多斯盆地上古生界地层中,当埋深小于2200米时,该阶段以孔隙性输导体系为主；当埋深大于2200米时,该阶段以裂缝性输导体系为主。(4)鄂尔多斯盆地上古生界构造演化分区与天然气的运移特征的研究鄂尔多斯盆地上古生界在构造演化过程中,拔尔赛—鄂托克前旗—吴起—富县以东一直处于相对稳定的区域,且在该区域内天然气的运移方向一直没有改变,因而天然气容易在这一区域内聚集成藏。将上古生界的天然气藏与今古相似区相叠合,不难发现两者具有很好的耦合度。因此从中侏罗世演化至今,构造演化的今古相似区是上古生界气藏主要分布的区域,非常规天然气沿着构造相对低点分布。
[Abstract]:Based on the regional geological data of the Upper Paleozoic in the Ordos Basin, the porosity sandstone and mudstone are studied by observing the pore structure of the core and casting thin slice, and combining with the determination and analysis of the conventional porosity and permeability. The transport properties and differences of fractured sandstone, mudstone and fault are studied. On this basis, the types of the Upper Paleozoic transport system in the basin are divided and its distribution is studied. At the same time, the evolution of Upper Paleozoic tectonic framework and the characteristics of hydrocarbon migration in Ordos Basin are studied. The main results are as follows: (1) in porous sand and mudstone, the connectivity and permeability in parallel direction are generally superior to those in vertical direction. In fractured sand and mudstone, the permeability of fracture developing direction is much larger than that of pore sand and mudstone around fracture. In the plastic compaction section, the transport performance of faults is generally poor, while in the elastic-plastic compression section and fracture section, the transport performance of fault is generally good. (2) the Upper Paleozoic transport system of Ordos Basin is classified in the Upper Paleozoic strata of Ordos Basin. The natural gas transportation system can be divided into two types: porosity based transportation system and fracture based transportation system. At the same time, there are a small number of fault-dominated transport systems. (3) the distribution characteristics of the Upper Paleozoic transport system in the Ordos Basin are in the Upper Paleozoic strata of the Ordos Basin. When the buried depth is less than 2200 meters, this stage is dominated by the pore transport system. When the buried depth is more than 2200 meters, this stage is dominated by fissured transport system. (4) study on the tectonic evolution zoning of Upper Paleozoic and the migration of natural gas in Ordos Basin during the tectonic evolution of the Upper Paleozoic in Ordos Basin. Due to the fact that the migration direction of natural gas has not changed in the area to the east of Badesai-Otoki Qianqi-Wuqi-Fuxian county, it is easy for the gas to accumulate in this area to form a reservoir. It is not difficult to find that the gas reservoirs of the Upper Paleozoic have a good degree of coupling with the similar areas of modern and ancient. So from the Middle Jurassic to now, the similar area of tectonic evolution is the main distribution area of Upper Paleozoic gas reservoir, and unconventional natural gas distributes along the relatively low point of the structure.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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