Formation mechanism and distribution prediction of high-quality marine reservoir in deeper Sichuan Basin
Formation mechanism and distribution prediction of high-quality marine reservoir in deeper Sichuan Basin
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发表时间：
2006
影响因子：
7.5
通讯作者：
Liang Yingbo
中科院分区：
文献类型：
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作者：
Liang Yingbo
四川盆地深层海相沉积碳酸盐岩储层以白云岩为主，与石膏质岩互层，经历了深埋过程，易发生TSR（Thermochemical Sulfate Reduction）和H2S的形成与聚集。由于TSR源H2S在水中溶解后具有较强的腐蚀性，深层储层发生了流岩相互作用，形成了优质储层和次生孔隙。由于高温和高浓度的硫化氢，酸性腐蚀作用在深部强烈，形成了发育良好的次生孔隙。含石膏质岩石的多孔储层是TSR反应的基础。TSR的发生进一步优化了储层质量，形成了高孔高渗的孔隙储层复合体。此外，腐蚀在较深的地层中更为严重。H2S对储层的腐蚀可能通过对原有孔隙的改造和扩张形成更大的孔隙，或者形成新的剥蚀孔隙。H2S的形成和分布可用于深部优质储层的预测。
TSR(Thermochemical Sulfate Reduction) and the formation and accumulation of H2S occurred easily in the deep marine sedimentary carbonate reservoir of the Sichuan Basin,because reservoirs there were mostly composed of dolostone,which were interbedded with gypsiferous rocks, and experienced a deeply buried process.Fluid-rock interaction occurred in the deep reservoirs and caused the formation of high-quality reservoirs and secondary pores because H2S of TSR origin exhibited strong corrosion after dissolving in water.Because of the high temperature and high concentrations of hydrogen sulfide,the acid corrosion acted intensely in the deep strata,resulting in the well-developed secondary pores.The porous reservoir with gypsiferous rock was the base of TSR reaction.The occurrence of TSR further optimized the quality of reservoir,and led to the developed pore reservoir complex of high porosity and permeability.Furthermore,the corrosion was more acute in the deeper strata.The corrosion of H2S to reservoir might form larger pores through the reconstruction and dilation of original pores,or form new denudation pores.The formation and distribution of H2S may be used to predict the deep highquality reservoir.