LF35-1-1井再研究与潮汕坳陷中生界油气勘探潜力分析
发布时间：2019-02-16 04:31
【摘要】：珠江口盆地潮汕地区中生界地层厚度大而全,前期勘探部署了多条二维地震测线、及靖海三维地震区,在潮汕地区北部部署LF35-1-1井。前期在地震地层层序,岩性、沉积等方面已取得一定的研究成果。本次研究主要依据LF35-1-1井前期研究成果结合二维、三维地震,针对LF35-1-1井存在的岩石学、地层学等问题,深入分析了该井中生界火山岩岩性、地层划分、沉积相和该区的中生界油气勘探潜力。首先,开展LF35-1-1井岩性、薄片、测井解释的一致性校对工作,其次加密锆石测年对该井中生界内部界线进行了进一步调整与确认;再次,针对LF35-1-1井的火山岩进行岩石地球化学分析,并与岩石薄片鉴定、测井响应分析相结合,厘定了火山岩岩性,将LF35-1-1井侏罗-白垩系火山岩段由下而上划分为6个旋回,近20个期次。中下侏罗统以火山岩沉积为主,夹后期侵入的花岗岩、花岗闪长岩。晚侏罗世发生了相对海进(滨浅海)-海退(三角洲-陆坡斜坡扇)-再次海进(陆坡)的沉积过程。下白垩统表现为一个相对海退(陆坡-滨浅海)的沉积过程。上白垩统沉积主要河流相的漫滩平原夹河道沉积,局部含漫滩湖泊沉积,为干旱蒸发泻湖环境。最后,根据对过井的二维测线剖面井震结合反演,以及部分靖海三维进行虚拟井反演,分析了中生界暗色泥岩和储层的特征,表明三维地震区上侏罗统和下白垩统各有厚度约150m和75m厚的纯泥岩,作为生烃岩具有一定的规模,分析了中生界的勘探前景。
[Abstract]:The Mesozoic strata in Chaoshan area of Pearl River mouth basin are thick and complete. In the early exploration, many 2-D seismic lines and Jinghai 3-D seismic area were deployed, and LF35-1-1 well was deployed in the northern part of Chaoshan area. Some achievements have been made in seismic sequence, lithology, sedimentation and so on. Based on the previous research results of LF35-1-1 well combined with 2D and 3D earthquakes, the lithology and stratigraphic division of Mesozoic volcanic rocks in LF35-1-1 well are analyzed in depth in allusion to the problems of petrology and stratigraphy in LF35-1-1 well. Sedimentary facies and Mesozoic hydrocarbon exploration potential in the area. First, the LF35-1-1 well lithology, thin slice, log interpretation consistency proofreading work is carried out. Secondly, the internal boundary of the Mesozoic is further adjusted and confirmed by the infilled zircon dating. Thirdly, the lithology of volcanic rocks in LF35-1-1 well is determined by means of rock geochemistry analysis, lithochemical analysis and log response analysis. The Jurassic-Cretaceous volcanic rocks in LF35-1-1 well are divided into 6 cycles and 20 periods from bottom to top. The middle and lower Jurassic is dominated by volcanic deposits, intercalated granite and granodiorite. In the late Jurassic, the sedimentary processes of relative sea (littoral) -regressive (delta-slope fan) and reentry (continental slope) occurred. The Lower Cretaceous is characterized by a sedimentary process of relative regression (continental slope-shore shallow sea). The main fluvial facies of the Upper Cretaceous are the floodplain plain interbedded channel deposition, and the local alluvial lacustrine deposit, which is an arid evaporative lagoon environment. Finally, the characteristics of Mesozoic dark mudstone and reservoir are analyzed according to the combined well seismic inversion of 2-D logging profile and the virtual well inversion of part of Jinghai. The results show that there are 150 m and 75 m thick pure mudstone in upper Jurassic and lower Cretaceous respectively in three dimensional seismic area. As hydrocarbon generating rocks, the exploration prospect of Mesozoic is analyzed.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
本文编号：2424046
[Abstract]:The Mesozoic strata in Chaoshan area of Pearl River mouth basin are thick and complete. In the early exploration, many 2-D seismic lines and Jinghai 3-D seismic area were deployed, and LF35-1-1 well was deployed in the northern part of Chaoshan area. Some achievements have been made in seismic sequence, lithology, sedimentation and so on. Based on the previous research results of LF35-1-1 well combined with 2D and 3D earthquakes, the lithology and stratigraphic division of Mesozoic volcanic rocks in LF35-1-1 well are analyzed in depth in allusion to the problems of petrology and stratigraphy in LF35-1-1 well. Sedimentary facies and Mesozoic hydrocarbon exploration potential in the area. First, the LF35-1-1 well lithology, thin slice, log interpretation consistency proofreading work is carried out. Secondly, the internal boundary of the Mesozoic is further adjusted and confirmed by the infilled zircon dating. Thirdly, the lithology of volcanic rocks in LF35-1-1 well is determined by means of rock geochemistry analysis, lithochemical analysis and log response analysis. The Jurassic-Cretaceous volcanic rocks in LF35-1-1 well are divided into 6 cycles and 20 periods from bottom to top. The middle and lower Jurassic is dominated by volcanic deposits, intercalated granite and granodiorite. In the late Jurassic, the sedimentary processes of relative sea (littoral) -regressive (delta-slope fan) and reentry (continental slope) occurred. The Lower Cretaceous is characterized by a sedimentary process of relative regression (continental slope-shore shallow sea). The main fluvial facies of the Upper Cretaceous are the floodplain plain interbedded channel deposition, and the local alluvial lacustrine deposit, which is an arid evaporative lagoon environment. Finally, the characteristics of Mesozoic dark mudstone and reservoir are analyzed according to the combined well seismic inversion of 2-D logging profile and the virtual well inversion of part of Jinghai. The results show that there are 150 m and 75 m thick pure mudstone in upper Jurassic and lower Cretaceous respectively in three dimensional seismic area. As hydrocarbon generating rocks, the exploration prospect of Mesozoic is analyzed.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13
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