南黄海盆地南五凹陷中-新生界油气资源潜力及勘探方向

南黄海盆地自油气勘探工作以来，尚未取得油气商业发现。对南五凹陷烃源岩及资源潜力认识还不足，有利区带及勘探方向还认识不清。针对该问题，该文利用新钻井资料及周边区域地质资料，对南五凹陷烃源岩有机质丰度、成熟度等烃源指标进行系统评价，利用TSM盆地模拟开展油气资源潜力分析，优选有利勘探区带，明确重点区带成藏条件及关键要素。研究发现南五凹陷古新统阜宁组为主力烃源岩，为受海侵影响的偏咸水湖相沉积，发育中等-好程度低熟-成熟烃源岩，干酪根类型以II₂型为主。落实凹陷资源规模2.26×10⁸ t，研究区北部斜坡内带近生烃中心，是油气输导优势指向区，为最有利勘探区带，构造脊为油气富集带，研究成果对下步在南五凹陷勘探具有重要的理论指导意义。

The commercial discoveries of oil and gas have not been made in South Yellow Sea Basin since the oil and gas exploration work. There is still insufficient understanding of the source and resource potential of Nanwu Sag, and the favorable zones and exploration directions are still unclear. In response to this issue, this article uses new drilling data and surrounding geological data to systematically evaluate the organic matter abundance, maturity, and other hydrocarbon source indicators of the source rocks in Nanwu Sag. TSM basin simulation is used to analyze the potential of oil and gas resources, select favorable exploration zones, and clarify the reservoir formation conditions and key elements of key zones. The research has found that the Funing Formation of the Paleocene in Nanwu Sag is the main source rock, which is a saltwater lacustrine sedimentary system affected by marine invasion. It develops medium to good, low maturity to mature source rocks, and the main type of kerogen is II₂ type. The resource scale of the depression is 226 million tons, and the near hydrocarbon generation center in the northern slope of the research area is the advantageous direction area for oil and gas transportation and the most favorable exploration zone. And the structural ridge is the oil and gas enrichment zone. The research results have important theoretical guiding significance for the next exploration in Nanwu Sag.