四川盆地绵阳—长宁拉张槽特征及形成演化

doi:10.3969/j.issn.1006-6535.2025.05.003

摘要/Abstract

摘要： 绵阳—长宁拉张槽两侧勘探取得良好效果,但拉张槽的特征、成因及其对油气成藏的控制作用还存在一定争议,制约了下步的勘探部署。为此,基于区域地震测线及关键探井资料,重点对绵阳—长宁拉张槽内部下寒武统层序沉积充填及不整合面特征开展研究。结果表明:绵阳—长宁拉张槽呈近南北向展布,平面上可划分为内带、中带、外带,纵向上,拉张槽内部发育2期充填沉积、2期广覆式沉积、2期沉积超覆不整合面;麦地坪组一段及筇竹寺组一、二段2期充填是造成槽内地层厚度异常增大的直接原因,2期沉积超覆不整合面发育在2期充填沉积体底部,表明研究区发生了2期基底沉降;兴凯地裂运动的幕式活动是2期基底沉降的内在动力,也是拉张槽形成的内因,拉张槽的发育可分为幼年期、壮年期及老年期,其中,筇竹寺早期为壮年期;拉张槽主要控制下寒武统烃源岩发育及灯影组源-储匹配,东侧陡坡带优质烃源岩发育,源-储空间匹配好,为灯影组油气藏富集带,是下步的主要勘探方向。该认识对四川盆地灯影组的下步勘探具有一定的指导意义。

关键词: 充填沉积, 形成演化, 绵阳—长宁拉张槽, 四川盆地

Abstract: Exploration on both sides of the Mianyang-Changning Tensional Trough has achieved good results, but there are still controversies regarding the characteristics, genesis and control effects on hydrocarbon accumulation of the tensional trough, which restrict further exploration deployment. For this purpose, based on regional seismic lines and key exploratory well data, the study focuses on the sequence sedimentary filling and unconformity characteristics of the Lower Cambrian inside the Mianyang-Changning Tensional Trough. The results indicate that the Mianyang-Changning Tensional Trough extends nearly north-south and can be divided into inner, middle and outer zones horizontally. Vertically, the trough interior developed two stages of filling sedimentation, two stages of widespreadsedimentation and two stages of sedimentary onlap unconformities,the two stages of filling in the first member of the Maidiping Formation and the first and second members of the Qiongzhusi Formation are the direct causes of abnormally increased stratigraphic thickness in the trough. The two stages of sedimentary onlap unconformities developed at the bottom of the two stages of filling sedimentary bodies, indicating two stages of basement subsidence in the study area; the episodic activity of the Xingkai taphrogeny is the internal driving force for the two stages of basement subsidence and also the internal cause for the formation of the tensional trough. The development of the tensional trough can be divided into juvenile, mature, and senescent stages, with the early Qiongzhusi period being the mature stage; the tensional trough mainly controls the development of Lower Cambrian source rocks and the source-reservoir matching of the Dengying Formation. The steep slope zone on the eastern side has high-quality source rock development and good spatial source-reservoir matching, making it the enrichment zone for Dengying Formation oil and gas reservoirs and the main direction for future exploration. This understanding has certain guiding significance for the next step of exploration in the Dengying Formation of the Sichuan Basin.

Key words: filling sedimentation, formation and evolution, Mianyang-Changning Tensional Trough, Sichuan Basin

中图分类号:

TE122

王海军. 四川盆地绵阳—长宁拉张槽特征及形成演化[J]. 特种油气藏, 2024, 32(5): 19-27.

WANG Haijun. Characteristics and formation evolution of the Mianyang-Changning Tensional Trough in the Sichuan Basin[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 19-27.

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