岩性油气藏 ›› 2021, Vol. 33 ›› Issue (5): 107119.doi: 10.12108/yxyqc.20210510
许璟1,2, 贺永红2, 马芳侠2, 杜彦军2, 马浪2, 葛云锦2, 王瑞生3, 郭睿2, 段亮1
XU Jing1,2, HE Yonghong2, MA Fangxia2, DU Yanjun2, MA Lang2, GE Yunjin2, WANG Ruisheng3, GUO Rui2, DUAN Liang1
摘要: 鄂尔多斯盆地定边油田沙涧区的中生界具有储层非均质性强、多套油水系统相互叠置和低电阻率与常规电阻率油层并存的特点。为了识别有效储层,基于岩心、测井、录井、试油试采、高压物性和密闭取心等资料建立了主力油层延9、长6和长9储层参数测井解释模型,综合分析了各油层组的有效厚度下限,并探讨了储层物性和电性下限的差异性成因。结果表明:①定边油田沙涧区延9、长6和长9油层组有效厚度孔隙度下限分别为12.5%,9.0%,7.0%,渗透率下限分别为2.0 mD,0.2 mD,0.3 mD,声波时差下限分别为239 μs/m,222 μs/m,213 μs/m,电阻率下限分别为6.0 Ω·m,13.0 Ω·m,17.5 Ω·m,含油饱和度下限分别为47.5%,44.0%,41.5%。②差异化成岩作用造成了各油层组物性下限的不同,其中压实和碳酸盐岩胶结作用发育较弱的延9油层组物性条件相对长6、长9油层组好;长6油层组中绿泥石膜的发育使部分粒间孔得以保存,而自生黏土易堵塞孔喉,导致渗透率低;长9油层组因强压实和胶结作用而减少的孔隙度大于长6油层组,但后期溶蚀作用对储层渗透性的改善作用较长6油层组强。③钻井液的侵入、储层物性和黏土附加导电作用的影响是导致延9油层电阻率下限值低的主要原因。客观理解主力油层有效储层厚度下限的不同和差异的成因,有助于深入认识鄂尔多斯盆地中生界油藏的储层变化规律,提高储层有利区预测的精度。
中图分类号:
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