塔北地区三叠系沉积特征及油气勘探意义

塔北地区120 余口井的录井和测井资料综合分析，近2. 5 × 104 km 二维地震剖面地震相分析和部分三维地震数据体地震振幅属性分析和相干分析表明: 塔北地区三叠系主要发育曲流河、辫状河、三角洲、滨浅湖、半深湖和深湖6 种沉积相。结合区域石油地质条件和沉积演化分析，认为三叠系发育的曲流河和辫状河河道、三角洲的水上分支河道和水下分流河道具备形成岩性圈闭的地质条件，是有利的岩性勘探目标。

Depositional characteristics of Triassic in northern Tarim Basin and its significance for petroleum exploration

According to the logging data and well logging data of 120 wells，the authors analyze the seismic facies of 25 000 kilometers two dimensional seismic sections and analyze seismic attributes of the three dimensional seismic data of the northern Tarim area，using the seismic amplitude attributes，coherence and seismic facies as the main research techniques． Six sedimentary facies developed in the Triassic: meandering river，braided river，delta， littoral-shallow lake，half-deep lake and deep lake． With the comprehensive analysis of oil and gas accumulation and the sedimentary evolution history，the sandbodys of the meandering river channel，braided river channel，aquatic bifurcating channels and subquatic distributary channel in the Triassic are considered to be favorable lithological- prospecting objects．