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鄂博梁构造带位于柴达木盆地西北缘,其成岩作用十分复杂,其储集性能主要受沉积相和成岩作用控制,砂岩储层为典型的低孔低渗储集岩,非均质性强。该区流体活动复杂,各种成岩作用都有一定程度的发育,胶结作用最为发育,即对压实作用有一定的抵消作用,同时也大大填充了孔隙空间,破坏储集性能;压实作用广泛发育,对孔隙空间主要为破坏作用;溶蚀作用多见,形成大量次生孔隙,对储层的储集性能有利;交代作用多发生,其明确的显示了流体活动的时间顺序。研究区的流体活动信息主要表现为:该区既存在酸性流体活动,又存在碱性流体活动,还有油气的充注,且均具有多期次性。
Ebolang tectonic belt is located in the northwestern margin of the Qaidam Basin. Its diagenesis is very complicated. Its reservoir performance is mainly controlled by sedimentary facies and diagenesis. The sandstone reservoir is a typical low-porosity and low-permeability reservoir with strong heterogeneity . The fluid activity in this area is complex, all kinds of diagenesis have some degree of development, the cementation is the most developed, that is to say, it has a certain offsetting effect on the compaction and greatly fills the pore space to destroy the reservoir performance; Development of pore space is mainly for the destruction of the role of erosion more common, the formation of a large number of secondary pores, the reservoir reservoir performance is favorable; account of the occurrence of multiple occurrences, which clearly shows the time sequence of fluid activity. The information of fluid activities in the study area mainly shows as follows: There are both acidic fluid activity, alkaline fluid activity, and oil-gas charge in the area, all of which are of multi-period nature.