渤东凹陷烃源岩生烃潜力研究

HYDROCARBON GENERATION POTENTIAL OF THE SOURCE ROCKS IN BODONG SEG

通过对渤东凹陷烃源岩生烃潜力的系统评价,认为东营组烃源岩有机质丰度达到中等—好烃源岩标准,渤东、渤中凹陷烃源岩类比研究推测沙河街组烃源岩有机质丰度更高;东营组烃源岩Ⅰ、Ⅱ1、Ⅱ2 和Ⅲ型有机质均有分布,但以Ⅱ1、Ⅱ2 型为主;与渤中凹陷对比表明,两者在有机质丰度、类型和沉积环境等方面具有很大的相似性,推测两凹陷沙河街组烃源岩具有相同性质。油源对比认为,渤东凹陷油源主要为沙河街组烃源岩,东营组烃源岩贡献很少;盆地模拟结果显示渤东凹陷石油、天然气资源量分别为7.91×108 t和220.2×108 m3,其勘探前景良好。

Through systematically evaluating the hydrocarbon generation potential of the source rocks in Bodong seg, it was considered that the organic matter abundance of the hydrocarbon source rocks in Dongying Formation has attained the standard of medium-good source rocks and that in Shahejie Formation would be much higher by comparing the hydrocarbon source rocks in Bodong seg with those in Bozhong Seg. The organic matters of Types I, II 1, II 2, and III were found out in the hydrocarbon source rocks in Dongying Formation, in which the Types II 1 and II 2 are in the majority. According to the comparison results, it was indicated that the organic matter abundance and type, and sedimentary environment in both Bodong Seg and Bozhong Seg are much similar to each other, so that the hydrocarbon source rocks in Shahejie Formation are of the same property by inference. In light of oil-to-source correlation, it was considered that the oil in Bodong Seg mainly came from Shahejie Formation and little from Dongying Formation. The basin simulation results showed that the oil and gas resources were 0.791×109 t and 22.02×108 m3 respectively the prospects being broad.