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通过对鄂尔多斯盆地西部姬塬地区三叠系延长组的岩石铸体薄片分析和扫描电镜的观察认为,早期自生绿泥石胶结对原生孔隙的转化、保存和改造起重要作用,主要表现为占据原生孔,并将其转化为黏土矿物晶间孔的形式,从空间上阻碍硅质胶结、碳酸盐胶结对孔隙的破坏,为后期流体改造储集层提供了通道;其亲油的黏土矿物属性,为后期油气在低孔、低渗储集层中成藏提供了条件。另外,因绿泥石化学性质较活泼,易发生水解,在开发具有绿泥石胶结的油藏时,应考虑到黏土矿物的敏感性。研究认为,绿泥石环边形成后储集层仍有较强的压实现象,前人认为的抗压能力可能被夸大。
Through the analysis of the thin slab and the scanning electron microscope (SEM) observations of the Triassic Yanchang Formation in the western Jiyuan area of the Ordos Basin, it is concluded that the early authigenic chlorite cement plays an important role in the transformation, preservation and transformation of primary pores, Pore and transformed into the form of intergranular pores in clay minerals, which hinders the siliceous cementation and carbonate cementation from spatially disrupting the pores, and provides a channel for later fluids to reform the reservoir. The lipophilic clay mineral properties , Which provided conditions for later hydrocarbon accumulation in low-porosity and low-permeability reservoirs. In addition, because chlorite chemical properties more lively, prone to hydrolysis, the development of a reservoir with chlorite cement should take into account the sensitivity of clay minerals. The study suggests that the formation of chlorites after the formation of the reservoir is still strong compaction phenomenon, the compressive capacity of the former think that may be exaggerated.