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桐湾运动作为震旦纪—早寒武世多幕构造运动逐渐受到关注,目前,对其与震旦系灯影组岩溶储层密切相关认识较为一致,然而其与震旦纪—早寒武世古构造形成关系的认识存在分歧。由于古构造与油气地质条件密切相关,因此,深入研究桐湾运动具有重要意义。通过钻井、露头、川中地区地震资料分析,结合区域地质资料,研究桐湾运动期次、运动性质、发育范围及对震旦纪—早寒武世古构造的影响。结果表明:1桐湾3幕构造运动性质为幕式整体抬升,桐湾Ⅰ幕、Ⅱ幕扬子区广泛发育,桐湾Ⅲ幕相对局限,同一幕构造运动不同地区强弱表现不同,反映局部存在差异升降;2桐湾期幕式抬升、局部差异升降,加剧隆坳格局分异,并可将四川盆地震旦纪—早寒武世构造演化划分为隆坳雏形期、隆坳分异初期、隆坳发育期、隆坳强烈分异期、隆坳形成期、隆坳调整期和隆坳填平补齐期7个阶段;3古构造高地与桐湾期幕式抬升综合作用,使得隆起区沉积的丘滩体幕式抬升暴露,有利岩溶储集层发育,桐湾期不整合面可作为震旦系古油藏以及现今气藏形成过程中油气运移的优势通道。桐湾期多幕运动对震旦纪—早寒武世构造演化、储层发育及油气运聚均有重要影响。
As the Sinian - Early Cambrian tectonic movement, the Tongwan movement has received more and more attention. At present, the Tongwan movement is closely related to the Sinian Dengying Formation karst reservoir. However, the Tongwan movement was associated with the Sinian - Early Cambrian There are disagreements about the formation and formation of relations. As the palaeotectonics is closely related to the geological conditions of oil and gas, it is of great significance to study the Tongwan movement in depth. Through drilling, outcropping, seismic data analysis in central Sichuan Basin, combined with regional geological data, the paper studies the effects of the period, the nature of movement, the developmental range and the paleostructures of the Sinian-Early Cambrian in the Tongwan movement. The results show that the tectonic movement of Tongwan 3 Curtain is entirely uplifted, and the Tongwan Ⅰ and Ⅱ subduction areas are widely developed. Tongwan Ⅲ curtain is relatively confined. The strength and weakness of different tectonic movements in the same curtain show different parts, reflecting the local existence The uplift of Tongwan period and the rise and fall of local differences intensify the pattern of up-down pattern. The Sinian-Early Cambrian tectonic evolution of the Sichuan Basin can be divided into the embryonic stage of uplift, the initial stage of uplift, Long col formation, strong colder senescence, colony formation period, uplift adjustment period and filling uplift period of seven stages; 3 paleotectonic height and Tongwan period curtain uplift combined effect, making uplift The uplifted exposure of the deposited canopy beach body curtain favors the development of favorable karst reservoirs. The Tongwan period unconformity surface can be used as the predominant channel for the Sinian paleo-oil reservoirs and the hydrocarbon migration during the formation of today’s gas reservoirs. The multi-curtain movement in Tongwan period had an important effect on the tectonic evolution, reservoir development and hydrocarbon migration and accumulation during the Sinian-Early Cambrian.