川东北礁滩天然气勘探新进展及关键技术

川东北地区位于四川盆地东北部，是中国石化勘探南方分公司天然气勘探的主战场。该区地表地形复杂，二叠系、三叠系目的层埋藏深（5 500～7 500 m），储层受沉积相带控制，识别难度大，经历多期构造演化且各区块差异大，给油气勘探带来极大的困难。近年来，该公司在已有成果认识的基础上，通过深化二叠系、三叠系台缘礁滩相油气地质综合研究及勘探技术攻关，进一步明确了台缘礁滩相储层发育特征和油气成藏富集规律；形成了独具特色的“相控三步法”礁滩储层有效预测技术和深部高精度三维地震采集处理一体化及复杂超深井钻井等先进适用配套技术，使得礁滩相勘探目标不断拓宽；探明了普光气田，新近发现了元坝气田，还取得了涪陵北部高陡复杂构造区复向斜部位礁滩相勘探突破，实现了天然气储量的快速增长。

Newest progress and key techniques in gas exploration of reef-bank reservoirs in the northeastern Sichuan Basin

The northeastern Sichuan Basin is the major area of gas exploration for the Sinopec South Exploration Company.Gas exploration in this area is challenged by complex surface conditions,large burial depths of the Permian and Triassic targets(5500-7500 m),control of sedimentary facies belt on reservoirs,multistage tectonic movements,and large differences between blocks.In recent years,based on comprehensive geologic research,a deep understanding is achieved of the development characteristics of the Permian and ...