红河油田前侏罗纪古地貌与延安组油气富集关系研究

利用残余地层厚度法与三维物探界面识别法相结合,建立了红河油田前侏罗纪古地貌图,研究区内发育两条大水系和若干次级水系,南支为二级古河庆西古河的支流、从西南方向注入庆西古河,北支同为二级古河庆西古河的支流、从西南向北注入。将微地貌划分为河谷、山脊、山谷、高地、河间丘、泛滥平原6种古地貌单元。研究表明,古地貌景观基本控制了延安组下部的储层展布及构造形态;古河谷的下切作用不仅使延安组与油源层的接触距离缩短,而且为油气提供优势运移通道。

Relation study between Pre-Jurassic palaeogeomorphology and hydrocarbon enrichment of Yanan formation in Honghe oilfield

In combination with the method of residual strata thickness and 3D interface recognition method of geophysical prospecting,the palaeogeomorphic map of Pre-Jurassic has been established.There are two major water systems and several secondary water systems developed in the study area.The south one is the tributary of the secondary ancient river,namely Qingxi River,which is into the Qingxi River from southwest.While the north one is also the tributary of Qingxi River and into the Qingxi River from southwest to north.The microtopography can be divided into 6 kinds of paleogeomorphology units,namely valley landforms,ridges,valleys,highland,mound and flood plain.The research results show the Palaeogeomorphology basically controlled the reservoir distribution and structural form of lower part of Yanan formation.The incised role of the ancient valley not only shortens the contact distance between Yanan formation and oil source layer,but also provides preferential migration pathway for hydrocarbon.