应用岩心、薄片、扫描电镜、储层物性和黏土矿物X衍射等资料,研究了三塘湖盆地侏罗系储集层的岩石学特征,发现中下侏罗统低压油藏中长石大量被溶蚀,高岭石非常发育,占全岩的3%～16%,平均为9.6%。研究表明,长石溶蚀过程中,伴随着高岭石的形成,地层水被消耗,孔隙中流体含量降低,储层孔隙体积增加了约1%,孔隙流体压力平均降低了2MPa,说明长石溶蚀作用是中下侏罗统油藏压力降低的重要影响因素。 The petrographic characteristics of the Jurassic reservoirs in the Santanghu Basin have been studied by using core, thin slice, scanning electron microscopy, reservoir properties and X-ray diffraction of clay minerals. It is found that the mid-lower Jurassic low-pressure reservoirs are greatly enriched Dissolution, kaolinite very well, accounting for 3% to 16% of the whole rock, with an average of 9.6%. The results show that with the formation of kaolinite, formation water is consumed during the feldspar dissolution process, and the fluid content in the pores decreases. The pore volume increases by about 1% and the pore fluid pressure decreases by 2 MPa on average, indicating that the feldspar dissolution The role is an important factor in the pressure drop of the Middle-Lower Jurassic reservoirs.