曹脊翔,李唐律,刘雪,肖柏夷,李建海,左强
CAO Jixiang,LI Tanglü,LIU Xue,XIAO Baiyi,LI Jianhai,ZUO Qiang

• 1:中国石油西南油气田公司致密油气勘探开发项目部
• 2:福瑞升(成都)科技有限公司

摘要(Abstract)：

为了明确四川盆地公山庙地区侏罗系凉高山组的沉积特征及演化规律，利用分频处理、地层切片和RGB属性融合等地震沉积学方法，在层序格架和岩心的约束下，开展凉高山组沉积相精细刻画。结果表明：凉高山组经历了1次完整的湖侵—湖退过程，为1个完整的三级层序，可细分为SQ1、SQ2和SQ3共3个四级层序；受西北龙门山物源影响明显，公山庙地区凉高山组的重矿物ZTR指数呈现由西向东依次增大的趋势，地层厚度和含砂率则由西向东迅速减小；公山庙地区凉高山组储层沉积以辫状河三角洲前缘沉积为主，局部见辫状河三角洲平原和半深湖，可细分为6种微相；利用岩心和测井曲线对多属性RGB融合结果进行标定，SQ1时的湖盆面积小、水体浅，以三角洲平原的砂质沉积为主；SQ2时随着大规模湖侵，沉积了巨厚的半深湖泥页岩，是公山庙地区重要的烃源岩层和页岩油层；SQ3时湖平面下降，发育大规模水下分流河道砂体，是研究区主要的致密油层。研究成果可为公山庙地区凉高山组的油藏分布预测提供理论指导。
In order to determine the sedimentary characteristics and its evolution law of Lianggaoshan Formation in Gongshanmiao area of Sichuan Basin, seismic sedimentology methods including frequency division processing, strata slicing and RGB attributes fusion are used to finely characterize the sedimentary facies of Lianggaoshan Formation constrained by sequence framework and cores. The results show that, Lianggaoshan Formation experienced a complete transgression-regression cycle, and is a complete third-order sequence, which is subdivided into 3 fourthorder sequences including SQ1, SQ2 and SQ3. Affected by provenance from Longmenshan in western area, heavy mineral ZTR index of Lianggaoshan Formation shows growth trend from west to east in Gongshanmiao area, while strata thickness and sand content reduce quickly. Sedimentary facies of Lianggaoshan Formation in Gongshanmiao area are mainly braided river delta fronts and partially braided river delta plains and semi-deep lakes, and are further subdivided into 6 micro-facies. Multi-attributes RGB fusion results calibrated by core and logging curves show that in SQ1, there are small lake area and shallow water, with mainly sandy sediments in delta plains. In SQ2, huge thick semi-deep lake mud shale deposit with large-scale lake transgression, which are the main hydrocar-bonsource rack shale oil reservoirs in Gongshanmiao area. In SQ3, lake level falls, with large-scale distributary channel sandbodies developed, which are the main tight oil reservoirs in studied area. The research provides theoretical guidance for the prediction of reservoirs distribution in Lianggaoshan Formation in Gongshanmiao area.

关键词(KeyWords)： 沉积特征;层序地层;凉高山组;公山庙地区;四川盆地;属性融合;地震沉积学
sedimentary characteristic;sequence strata;Lianggaoshan Formation;Gongshanmiao area;Sichuan Basin;attributes fusion;seismic sedimentology

Abstract:

Keywords:

基金项目(Foundation): 中国石油西南油气田公司科技专项“四川盆地中西部地区致密气成藏条件及物探关键技术研究”（2022ZD01-01）;; 中国石油西南油气田公司2022年勘探配套地震资料处理解释研究项目“西浅1井区凉高山组储层及含气性地震预测研究”（2022-145）

作者(Author): 曹脊翔,李唐律,刘雪,肖柏夷,李建海,左强
CAO Jixiang,LI Tanglü,LIU Xue,XIAO Baiyi,LI Jianhai,ZUO Qiang

DOI: 10.19597/J.ISSN.1000-3754.202403015

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