重磁电勘探在黑龙江三江盆地石炭系—二叠系油气地质调查中的应用

三江盆地东部地区零星出露有古生界石炭—二叠纪地层,总有机碳等烃源岩评价指标良好,但在盆地中的展布情况一直未知。在东北地区老油田开发成本日益高涨,亟需新的油气勘探接替区的背景下,为了查明三江盆地石炭—二叠纪地层的发育特征,在三江盆地以石炭—二叠系为主要目的层开展油气地质调查实施了重磁电勘探工程,对所取得的4条重磁电剖面资料进行了处理和定性分析,在综合信息反演和成像的基础上建立了重磁电综合反演剖面图。对研究区地层、物性特征进行了系统的研究与总结,主要利用大地电磁测深反演电阻率低阻标志层,初步刻画了石炭—二叠系的分布特征,并通过对二维反演电阻率断面进行残差处理,探索了石炭—二叠系泥岩的展布特征。

The application of gravity-magnetic-electric prospecting engineering for Carboniferous-Permian petroleum geological survey in Sanjiang Basin, Heilongjiang Province

Paleozoic Carboniferous-Permian strata occur sporadically in the eastern part of the Sanjiang Basin, their total organic carbon and other evaluation indexes of hydrocarbon source rocks are good, but their distribution in the basin has been unknown. In the background of the increasingly high cost of development and the urgent need of new oil and gas replacement area, the authors carried out oil and gas geological survey with gravity-magnetic-electric prospecting engineering in the Sanjiang Basin and established a comprehensive inversion profile through qualitative analysis, integrated information inversion and imaging for the purpose of identifying the developmental characteristics of the Carboniferous-Permian strata in the Sanjiang Basin,. The physical properties of the strata in the study area were systematically studied and summarized, and the distribution characteristics of the Carboniferous-Permian strata was preliminarily characterized by the use of magnetotelluric sounding inversion resistivity for the low-resistance marker layer. Then, the distribution characteristics of the Carboniferous-Permian mudstone were explored by the residual treatment of the two-dimensional inversion resistivity section.