塔里木盆地志留系下砂岩段成藏组合分析及有利勘探区带评价

多年勘探实践证明，塔里木盆地志留系发育良好的储盖组合，油气源充足，具有良好的勘探前景。以油气成藏组合理论为指导，结合塔里木盆地志留系勘探实践，将志留系下砂岩段划分为塔中、塔东、塔河地区3个油气成藏组合，并引入边缘概率对各成藏组合内的次级成藏组合进行综合分析。塔中地区储盖条件、圈闭条件发育良好，各次级成藏组合边缘概率均很高，综合评价为Ⅰ-Ⅱ类有利勘探区；塔东地区、塔河地区圈闭条件发育良好，但储盖条件不理想，各次级成藏组合边缘概率较低，综合评价为Ⅱ-Ⅲ类有利勘探区。

Play Analysis and Profitable Exploration Area Evaluation of Lower Sandstone Section of Silurian in Tarim Basin

The long exploration history has proved that Silurian system of Tarim Basin,with good reservoir-seal grouping and affluent oil and gas sources,provides a bright prospect for future exploration.Guided by the theory of play and combined with the exploration practice of Tarim Basin,the lower sandstone section of Silurian is divided into three plays,which include Tazhong,Tadong and Tahe areas.The marginal probability method is also introduced into the comprehensive analysis on the secondary plays in each play.The results show that the values of marginal probabilities of the secondary plays in Tazhong area where the reservoir-seal grouping and the traps are well developed,are high enough to be ranked as the Ⅰ—Ⅱ level area of profitable exploration.As for Tadong and Tahe areas,the traps developed well,but the conditions of reservoir-seal grouping are not good,and the marginal probabilities of the secondary plays are relatively low,so the secondary plays can be classified as the Ⅱ—Ⅲ level profitable exploration area.