四川盆地侏罗系油气成藏条件及勘探潜力  

Hydrocarbon accumulation conditions and exploration potentials of the Jurassic reservoirs in the Sichuan Basin

作　　者：蒋裕强[1] 漆麟[1] 邓海波[2] 王毓俊 蒋婵[1] 罗明生[1] 

机构地区：[1]西南石油大学 [2]中国石油西南油气田公司川中油气矿 [3]中国海油勘探开发研究院

出　　处：《天然气工业》2010年第3期22-26,共5页Natural Gas Industry

摘　　要：四川盆地侏罗系已发现以盆地中部(简称川中)为主体的多个石油富集构造。对四川盆地侏罗系油气成藏条件进行了分析,认为:①烃源岩条件好,资源量丰富;②储层物性差,但大面积分布,储盖组合优越;③圈闭类型多样。通过开展成藏模式研究,指出了有利勘探区域:①川中平缓构造区油藏分布不受构造控制,高能介屑滩、砂体叠加区及裂缝发育带是石油富集的主控因素,具备大面积低渗透油藏叠加连片分布的特征;②川东褶皱带向斜区侏罗系地层保存完整,成藏条件与川中基本相似,具有良好的勘探潜力;③龙门山、大巴山冲断带前缘可能发现多种类型的油藏或油气藏。建议开展老油田的挖潜工作,同时加大对川中北部及川东向斜区的勘探,寻找原油持续稳产的接替区域。Several oil-bearing structures have been discovered in the Jurassic of the central Sichuan Basin. The hydrocarbon accumulation conditions of the Jurassic in the Sichuan Basin are analyzed and the following understandings are obtained. ①The source rocks are high in quality and the petroleum resources are rich; ②The reservoirs are poor in poroperm characteristics but large in area, and the reservoir-seal combinations are favorable; ③There are many trap types. Based on a study of oil accumulation patterns, the following favorable exploration areas are identified. ①The gentle structure zone in the central Sichuan Basin. In this area, oil reservoir distribution is controlled not by the structures but by the superimposed high-energy shell debris banks and sandbodies as well as fractured zones. The low permeability reservoirs are superimposed and interconnected in large areas. ②The syncline area of the folded zone in the eastern Sichuan Basin. The Jurassic reservoirs in this area are well preserved and has similar conditions for hydrocarbon accumulation, thus the exploration potential is large. ③The frontal area of the Longmenshan-Dabashan thrust belt. Multiple hydrocarbon reservoirs may be discovered in this area. It is proposed to tap the exploration potential in the mature fields, meanwhile strengthen the exploration in the northern area of the central Sichuan Basin and the syncline area of the eastern Sichuan Basin.

关 键 词：四川盆地 侏罗纪 油气藏形成 条件 烃源岩 生储盖组合 圈闭 勘探潜力 

分 类 号：P618.13[天文地球—矿床学]