连续电磁剖面法探测油气藏有利构造区——以若羌凹陷南部阿尔金山前区为例  

The application of continuous electromagnetic profiling method to the exploration of oil and gas: A case study of Ruoqiang sag in Altun forelands

作　　者：赵亮[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《物探与化探》2015年第4期673-677,共5页Geophysical and Geochemical Exploration

基　　金：国家重大科技专项"大型油气田及煤层气开发"(2008ZX05001-001)

摘　　要：阐述了连续电磁剖面法(CEMP)在若羌凹陷南部阿尔金山前的应用。阿尔金山前由于地形起伏大,电磁静态效应严重,地下电阻率变化大,应用Robust处理、静校正、带地形二维连续介质反演成像的CEMP处理方式,反演精度高,符合实际情况。通过地震、非地震优势互补,联合攻关,建立构造解释模型,深化了地质结构认识,明确了阿尔金断裂系左行扭动走滑运动造成山前发育3组平行于阿尔金山的北东东走向断裂,山前凹陷整体呈现凹隆相间的构造格局,推测阿尔金山向若羌凹陷方向长距离逆掩推覆,元古界地层逆掩到中生界地层之上,阿尔金山前可能掩覆着厚度大、埋藏深、成熟度相对较高的侏罗系地层。The application of continuous electromagnetic profiling ( CEMP ) to Ruoqiang sag of the southern Altun Mountains is de?scribed in this paper. Because of the undulating landform, static electromagnetic effect is serious, and underground resistivity varies considerably. Robust processing applications, static correction and CEMP handling with terrain two?dimensional continuum inversion imaging can yield high inversion precision in line with the actual situation. Making full use of the complementary advantages of seismic and non?seismic survey, the author established the structural interpretation model so as to deepen the understanding of the geological structure. It is detected that the left twisting slip of the Altun fault system caused the formation of piedmont 3 groups of NEE?striking faults parallel to the Altun Mountains, and that the strike slip movement caused the piedmont depression to exhibit the concave and convex tectonic pattern of the Altun Mountains in Ruoqiang sag. It is inferred that the long distance overthrust nappe towards Ruoqiang Sag made the Proterozoic Paleozoic strata thrust onto the Mesozoic strata, and therefore Altun forelands possibly have covered Jurassic strata characterized by large thickness, great burial depth and relatively high maturity.

关 键 词：连续电磁剖面法 电性特征 若羌凹陷 CEMP预测 逆冲推覆 阿尔金山前区 

分 类 号：P618.13[天文地球—矿床学] P631.325[天文地球—地质学]