摘要:通过大量二维地震和三维地震资料的解释，结合已钻井资料的分析，刻画了绵竹—长宁裂陷两侧台地边缘的形态变化，探讨了不同地区台缘带沉积模式，研究了不同类型台缘带形成分布的控制因素，建立了3种成藏模式。研究结果表明：1）绵竹—长宁裂陷两侧发育灯二段和灯四段台缘带，灯二段台缘带呈现U型展布，灯四段台缘带呈现近平行分布；2）灯影组受断裂控制，经历了灯一+二期双断裂陷及灯三+四期箕状裂陷两个阶段演化；结合台地边缘形态，可分为陡坡型和缓坡型两大类台缘带，进一步划分出陡坡带加积型、缓坡带退积型、缓坡带加积型等3种类型；3）台缘带类型差异主要与断裂发育的规模大小相关，断裂发育区，形成陡坡带台缘，断裂不发育区，形成缓坡带台缘；古隆起核部，形成加积型台缘，远离古隆起区，形成退积型台缘；4）裂陷两侧发育台缘丘滩岩溶型储层，裂陷内沉积优质的下寒武统筇竹寺组烃源岩，两者有机匹配，形成陡坡带、缓坡带台缘两类成藏模式。目前勘探主要集中在陡坡带台缘，缓坡带台缘分布范围广，是未来的勘探重点部位。
关键词: 克拉通内裂陷/
台缘带类型/
形成主控因素/
丘滩储层/
成藏模式/
灯影组/
四川盆地
Abstract:Based on the interpretation of two-dimensional and three-dimensional seismic data, combined with the analysis of drilling data, the geomorphologic changes of platform margins on both sides of Mianzhu-Changning rift are described, the various sedimentary models of platform margin at different locations are established, and the controlling factors on different types of platform margin belt are discussed. Eventually, three hydrocarbon accumulation models are proposed. The results show that:1) Deng2 and Deng4 platform margin belts are developed on both sides of Mianzhu-Changning rift, the platform margin belt of Deng2 member is U-shaped, while the platform margin belt of Deng4 member is nearly parallel distributed; 2) The development of Dengying Formation is controlled by faults, and has undergone two stages of development:the Deng1+2 double-rift stage and Deng3+4 asymmetrical half graben stage. According to the geomorphology of the platform margin, it can be divided into steep slope type and gentle slope type, and can be further subdivided into three types:the type of aggradation on steep slope, the type of retrogradation on gentle slope, and the type of aggradation on gentle slope; 3) The type of platform margin is mainly related to the degree of fault development; the steep slope belt platform margin develops in the area with fault development, while the gentle slope belt platform margin develops in the area without fault development; the aggradational platform margin develops near the core of the paleo-uplift, the retrogradational platform margin develops away from the paleo-uplift; 4) The karst reservoirs on platform margin are developed on both sides of the rift,, and the source rock of ∈1q is deposited within the rift, the combination of them results in two types of hydrocarbon accumulation model on platform margin:steep slope belt type and gentle slope belt type. Currently, the exploration is mainly concentrated on the steep slope belt. However, the gentle slope belt platform margin is widely developed, which could be the key target of future exploration.
Key words:Intracratonic rift/
Types of platform margin belt/
Main controlling factors/
Mound-shoal reservoir/
Hydrocarbon accumulation model/
Dengying Formation/
Sichuan Basin
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