鄂尔多斯盆地西峰油田三叠系延长组长6-8段储层砂岩成岩作用研究

鄂尔多斯盆地西峰油田的储集岩-三叠系延长组长 6- 8段砂岩是典型的低孔低渗储集岩,具有粒径细、成分成熟度低、磨圆度较差、分选性较好的特点。运用薄片鉴定、粘土矿物、稳定同位素分析及物性分析等资料,研究了延长组长 6- 8段的成岩作用特征,分析了它们对储层物性的影响状况,确定了储层砂岩的成岩作用阶段,指出西峰油田优质储层的发育取决于储集砂岩中粘土膜形成作用、烃类侵位作用和溶蚀作用的发育状况.

Reservoir Sandstone Diagenesis of Memeber 6 to 8 in Yanchang Formation (Triassic), Xifeng Oilfield, Ordos Basin

Reservoir sandstone of Member 6 to 8 in Yanchang Formation (Triassic) in Xifeng oilfield of Ordos basin is typical of low porosity and low permeability, which has the characteristics of fine grain size, low compositional maturity, poor roundness and good sorting. Based on thin-section observation and analyses of c lay minerals, stable isotopes and physical property, this article takes researc h on diagenetic characteristics in Member 6 to 8 of Yanchang Formation, analyses their influence on reservoir physical property and determines diagenetic stage of reservoir sandstone. Meanwhile, this article indicates that the development o f high quality reservoir is dependent on the development of clay film, hydrocabo n emplacement grain dissolution in reservoir sandstone.