临河坳陷高效油气勘探综合物探技术及应用

Comprehensive geophysical technologies for efficient oil and gas exploration and application in Linhe Depression

针对临河坳陷主力生烃凹陷不清、构造及地层难以落实、成藏目标不清、突破井位难以落实等长期以来制约勘探的难点问题,提出了适用勘探新区高效勘探的技术路线及关键技术。以基于多种灵活约束机制的中浅层重力多密度界面反演及归一式重力正演剥层为核心,利用深层目标重力异常提取技术重新认识了临河坳陷地质结构。淖西深洼槽是临河坳陷的主力生烃区,临河坳陷南斜坡受黄河断陷槽控制,发育了中央断垒式潜山披覆构造带,具备两侧双源供烃的有利成藏条件,具有巨大的油气勘探潜力;提出并应用基于井、震资料控制的时频电磁模拟退火电阻率约束反演及基于精细地电结构模型的极化率约束反演等时频电磁目标储层油气检测技术,提高了深层目标的电性分辨率及目标储层的油气预测精度,快速锁定JH2x、LH1x及XH1井等靶区目标,为临河坳陷油气勘探的突破发挥了关键先导性作用,为低勘探程度新区、特别是盆地深层油气勘探提供了有效的方法与技术思路。

In view of the problems restricting exploration in Linhe Depression for a long time,such as unclear main hydrocarbon-generating sag and accumulation targets,as well as difficult implementation of structures and strata and well location breakthrough,the technical route and key technologies suitable for efficient exploration in new exploration area are put forward.This paper applies the deep target gravity anomaly extraction techno-logy based on multi-density interfacial gravity inversion of middle-to-shallow layers and normalized gravity forward stripping built on various flexible constraint mechanisms to re-understand the geological structure of Linhe Depression and identifies Zhuoxi deep trough as the main hydrocarbon-generating area of Linhe Depres-sion.It is pointed out that the southern slope of Linhe Depression is controlled by the Yellow River fault trough and develops the central fault-barrier buried hill overburden tectonic belt,which has favorable reservoir accumu-lation conditions with two hydrocarbon sources on both sides and has huge oil and gas exploration potential.The paper proposes and uses time-frequency electromagnetic target reservoir oil and gas detection technologies such as time-frequency electromagnetic simulated annealing resistivity constrained inversion based on well vi-bration control and polarizability constrained inversion based on fine geoelectric structure model,which im-proves the electrical resolution of deep targets and the accuracy of oil and gas prediction of target reservoirs and quickly locates the targets in wells JH2x,LH1x,and XH1.It plays a key leading role in the breakthrough of oil and gas exploration in Linhe Depression and provides effective methods and technologies for oil and gas explora-tion in new areas with low exploration degrees,especially in deep basins.