南海南沙海域沉积盆地构造演化与油气成藏规律

发布时间：2018-01-22 13:50

本文关键词： 构造阶段油气聚集南沙海域南海　出处：《大地构造与成矿学》2017年04期 　论文类型：期刊论文

【摘要】：据钻井、地震剖面、区域地质及磁异常条带分析解释,南沙海域及其邻区的主要沉积盆地的形成演化受裂谷起始不整合面和破裂不整合面分隔,可分为前裂谷期、裂谷期和后裂谷期3个构造阶段。大中型油气藏相关数据的统计表明,南沙海域及邻区大中型油气藏的成藏要素和油气田发育受构造阶段控制。(1)烃源岩发育具有分期、分区特征,礼乐盆地发育前裂谷期、裂谷1幕烃源岩;万安、曾母、西北巴拉望盆地发育裂谷2幕烃源岩,文莱-沙巴盆地发育后裂谷期烃源岩。(2)储层发育具有分期、分带特征,表现为外带老(裂谷2幕)、内带新(后裂谷期)。(3)圈闭类型包括构造、岩性地层圈闭及构造-岩性地层等因素形成的复合圈闭,大致具有内带以地层圈闭为主,外带以构造圈闭为主的特征。(4)大中型油气田分布具有外带砂岩富油气、内带碳酸盐岩富气特点。(5)南沙海域及邻区发育两个后裂谷期主含油气区,即东部巴兰三角洲砂岩背斜油气区和西部卢卡尼亚碳酸盐台地气区。其中,大中型气田的成藏要素组合为裂谷2幕烃源岩、后裂谷期碳酸盐岩储层和地层圈闭;大中型油气田则为后裂谷期烃源岩、砂岩储层和背斜圈闭。
[Abstract]:According to the analysis and interpretation of drilling, seismic profile, regional geological and magnetic anomalies, the formation and evolution of the main sedimentary basins in Nansha Sea area and its adjacent areas are separated by the initial unconformity surface of rift valley and the unconformity surface of rupture. It can be divided into three structural stages: the pre-rift period, the rift period and the post-rift stage. The reservoir forming elements and the development of oil and gas fields in Nansha sea area and adjacent area are controlled by tectonic stage. Wanan, Zengmu, northwestern Palawan basin developed rift 2 episode source rock, Brunei-Shaba basin developed post-rift source rock. 2) the reservoir developed in stages and zonation, showing that the outer belt is old (rift 2 act). The new (post-rift) trap types in the inner belt include structure, lithostratigraphic trap and structure-lithostratigraphic complex trap, which are mainly stratigraphic traps. The distribution of large and medium-sized oil and gas fields in the outer zone is characterized by sandstones rich in oil and gas, and carbonate rocks in the inner zone. 5) two major oil and gas bearing areas of the post-rift period are developed in Nansha sea area and adjacent area. That is, the eastern Balan Delta sandstone anticline and the western Lukania carbonate platform area. The reservoir forming elements of large and medium-sized gas fields are rift 2 episode source rock, post-rift carbonate reservoir and stratigraphic trap. Large and medium oil and gas fields are source rocks, sandstone reservoirs and anticline traps in the post-rift period.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;中海油研究总院;中国冶金地质总局第二地质勘查院;西北大学大陆动力学国家重点实验室;
【基金】：国家科技重大专项(2011ZX05025-005-03) 大陆动力学国家重点实验室基金(BJ081334)联合资助
【分类号】：P618.13
【正文快照】： 欧亚、印度-澳大利亚和太平洋-菲律宾三大岩石圈板块的相互作用使南海地区成为新生代全球板块活动最复杂的地区之一(Hall,1998,2013)。多年来,南海作为构造复杂地区一直受到不同地学研究计划和油气勘探的高度关注(Sandal,1996;Todd et al.,1997;Madon et al.,1999;Shipboard S

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