川中地区上三叠统须家河组埋藏史恢复及重点构造气水分布控制因素探讨
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摘要
上三叠统是四川盆地重要的含油气层系之一,资源潜力巨大,但是尚未对该区三叠系地层总体构造演化过程进行系统研究,对该区沉积演化过程中长期继承性的构造高点认识不清,影响了对该区的气水分布规律的认识,进而影响了对研究区上三叠统须家河组油气富集规律的认识和勘探目标的选择。
     本文在参阅了大量的相关文献的基础上,通过川中地区内120口井须家河组及其上覆地层的埋藏史恢复计算,结合气水分布关系,系统的对川中地区须家河组沉积后的构造进行了恢复,并对重点构造的古构造演化与气水分布的关系进行了分析,取得了以下主要认识:
     (1) 根据不同时期古埋深等值线图的分析,川中在须家河组沉积以来的区域古构造演化特征表现为长期继承性发展的川西凹陷和遂南—龙女寺隆起,川北的通江地区在须家河组、自流井沉积期间为斜坡区,沙溪庙组沉积以来为凹陷。遂南、磨溪、龙女寺、南充地区长期处于古构造发展的高部位,是油气聚集的有利地区。
     (2) 通过南充构造(包括充西地区)21口钻井分层数据和地层岩性资料进行的沉积埋藏史恢复计算,南充构造上三叠统须家河组的古构造演化特征表现为南充构造须四段的顶、底界古构造演化总体上具有相似性和继承性。
     (3) 通过南充须家河组古构造、现今构造及气水分布特征研究认为,南充须家河组气藏的气、水分布主要受构造及储层物性控制。
     (4) 通过磨溪构造沉积埋藏史恢复计算结果分析认为,磨溪须家河组构造形成时期相对较早;构造演化具有较强的继承性,由北到南“两高一鞍”的构造格局在演化过程中基本保持不变;构造的闭合高度在不同时期虽然有所变化,但总体上是随上覆地层不断沉积而逐渐增加。
     (5) 通过磨溪须家河组古构造、现今构造及气水分布特征,磨溪构造须家河组气藏的气、水分布仍然主要受构造及储层物性控制。
     (6) 通过南充构造和磨溪构造古构造与气水关系的剖析认为,总体上川中地区的气水分布受古构造和岩性的控制。
The upper Triassic is one of the important oil enrichment in Si chuan basin,it's abundant in petroleum deposits.But it's not yet studied the general tectonic evolution of the Triassic,and it's not realized really the inherited structural highs in the sedimentation ,and affected to know the Gas and Water Distributing Law in this area.and affected to know the Enrichment characteristics of oil and gas and the selection of roll exploration objects of Xujiahe Formation of the upper Triassic in this area.
    On the basis of reading a great amount of materials, the paper calculated and restored the burial history 120 wells at the Xujiahe formation and the overlying formation in the middle of Sichuan, combining with the gas-water relation analysis, sedimentation and tectonics of Xujiahe formation in the middle of Sichuan were restored systematically and key paleostructure evolution and gas-water contact was researched and the following conclusion were gained:
    (1) According to Algorithm analysis on paleoburial depth in different period, the regional paleostructure evolution in Xujiahe formation of the Middle Sichuan presents long-time succeeding developed from depression at west of Sichuan and Suinan-longnvsi uplift, at Tongjiang area of North of Sichuan depression was a slope during sedimentation of Xujiahe formation and Ziliujing formation , lasted for Shaximiao depression. It located in the high point of paleostructure in Suinan, Moxi, Longnvsi, Nanchong area, and it's the oil and gas advantageous accumulation zone.
    (2) Through burial history restoring on 21 wells of Nanchong structure, palaeostructure evolution in Xujiahe formation' of Nanchong structure in the upper Triassic shows traits of similarity and succeeding at Xujiahe formation.
    (3) By study on paleostructure, tectonics today and gas-water distribution of Nanchong structure it shows that the gas reservoir in Xujiahe formation was controlled by tectonic evolution and property of reservoir.
    (4) Through analysis of burial history restoring on Moxi structure,Moxi structure formed
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