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本文采用X射线衍射、岩石薄片、扫描电子显微镜不镀膜定位观察、能谱、电子探针及原子吸收等分析方法,详细研究了油气储层的酸敏性问题。发现储层酸敏性问题主要有粘土矿场、方解石、长石、沸石等酸敏矿物的溶蚀以及新形成的化学沉淀物堵塞孔隙。开讨论了各种矿物在酸化中的溶蚀程度,对三肇地区扶、杨油层的酸敏性进行了综合评价。此项研究为油气储层酸化工艺的研究及制定合理的酸化施工方案提供了重要的资料。
In this paper, the problem of acid sensitivity of oil and gas reservoirs has been studied in detail by X-ray diffraction, rock thin slices, uncoated orientation observation with scanning electron microscopy, energy dispersive spectroscopy, electron probe and atomic absorption spectroscopy. It is found that the acid sensitivity of the reservoir mainly includes the dissolution of acid-sensitive minerals such as clay mines, calcite, feldspar and zeolite, and the newly formed chemical precipitates to block the pores. Discussed the degree of dissolution of various minerals in the acidification, and comprehensively evaluated the acid sensitivity of Fuzang and Yang oil layers in Sanzhao area. This research provides important information for the research of acidizing process of oil and gas reservoirs and the formulation of reasonable acidizing construction scheme.