马朗凹陷芦草沟组致密储集层复杂岩性识别

Identification and Application of Complex Lithology of Lucaogou Tight Reservoir in Malang Sag,Santanghu Basin

优选了对岩性敏感的自然伽马、中子、密度和声波时差等测井曲线,建立了马朗凹陷芦草沟组复杂岩性识别交会图版,校正单井岩性剖面,并分析了致密储集层的特征。应用自然伽马、声波时差与重构曲线(视石灰岩中子孔隙度与密度孔隙度之差曲线)建立的综合岩性识别图版,识别出泥岩、凝灰质泥岩、灰质泥岩、泥质白云岩等12种主要岩性。研究结果表明,马朗凹陷芦草沟组源内致密储油层主要受岩性组合控制,其中,泥岩夹(薄层)灰质泥岩、白云质泥岩或者以灰质泥岩、白云质泥岩为主的岩性,为该区最有利岩性组合,含油性最好。

This paper selects the lithology-sensitive natural gamma, neutron, density and acoustic logging curves to establish lithology iden- tification cross-plot for Lucaogou tight reservoir in Malang sag of Santanghu basin, and identifies 12 kinds of main lithology, including mud- stone, tuffaceous shale, calcareous mudstone, argillaceous dolomite, etc. The study shows that the tight reservoir of Lucaogou formation is mainly controlled by the lithologic combination, of which the mudstone intercalated with （thin） calcareous mudstone and dolomitic mud- stone or the lithology dominated by calcareous mudstone and dolomitic mudstone is the most favorable lithologic comnination, and the oili- ness is the best.