南苏门达腊盆地中国石油合同区块成藏组合分析

南苏门达腊盆地是典型的弧后裂谷盆地，其演化经历了4大构造期：始新世中期到渐新世早期为裂谷发育期；渐新世晚期到中新世初期为裂谷-坳陷过渡期；中新世早期到末期为坳陷期；上新世早期至今为盆地反转期。盆地形成以始新统湖相泥岩、生储盖组合特征、圈闭构造风格与油气富集特点，可将其油气成藏组合划分为深部组合、下部组合、中部组合和上部组合。深部组合以新生古储式潜山油气藏为主；下部组合以自生自储式油气藏为主；中部组合以古生新储式油气藏为主；上部组合以与晚期反转构造有关的油气藏为主。3个中国石油合同区块发现的成藏组合各不相同，每一区块还具有发现其它成藏组合的潜力。

Petroleum play analysis of the PetroChina Contract Blocks in the South Sumatra Basin

The South Sumatra Basin is a typical back arc rift basin. The tectonic evolution of the basin underwent four stages as the Middle Eocene-Early Oligocene rifted stage, the Late Oligocene-Early Miocene rifted-sagged transitional stage, the Early-Late Miocene sagged stage and the Early Pliocene to present basin-inverted stage. The Eocene lacustrine mudstones, Oligocene lacustrine mudstones and carbonaceous shales are the source rocks of the South Sumatra Basin, and the Tertiary clastic and carbonate rocks are the reservoir of petroleum system. Based on the structural evolution features,source-reservoir-seal combinations, trap styles and hydrocarbon-accumulation characteristics, the petroleum plays of the South Sumatra Basin can be divided into deep, lower, middle, and upper plays. The discovered petroleum combinations are different in each block of the PetroChina Contract Blocks with potential for disclosing other petroleum plays.