【摘要】：珠江口盆地潮汕地區(qū)中生界地層厚度大而全,前期勘探部署了多條二維地震測(cè)線、及靖海三維地震區(qū),在潮汕地區(qū)北部部署LF35-1-1井。前期在地震地層層序,巖性、沉積等方面已取得一定的研究成果。本次研究主要依據(jù)LF35-1-1井前期研究成果結(jié)合二維、三維地震,針對(duì)LF35-1-1井存在的巖石學(xué)、地層學(xué)等問(wèn)題,深入分析了該井中生界火山巖巖性、地層劃分、沉積相和該區(qū)的中生界油氣勘探潛力。首先,開(kāi)展LF35-1-1井巖性、薄片、測(cè)井解釋的一致性校對(duì)工作,其次加密鋯石測(cè)年對(duì)該井中生界內(nèi)部界線進(jìn)行了進(jìn)一步調(diào)整與確認(rèn);再次,針對(duì)LF35-1-1井的火山巖進(jìn)行巖石地球化學(xué)分析,并與巖石薄片鑒定、測(cè)井響應(yīng)分析相結(jié)合,厘定了火山巖巖性,將LF35-1-1井侏羅-白堊系火山巖段由下而上劃分為6個(gè)旋回,近20個(gè)期次。中下侏羅統(tǒng)以火山巖沉積為主,夾后期侵入的花崗巖、花崗閃長(zhǎng)巖。晚侏羅世發(fā)生了相對(duì)海進(jìn)(濱淺海)-海退(三角洲-陸坡斜坡扇)-再次海進(jìn)(陸坡)的沉積過(guò)程。下白堊統(tǒng)表現(xiàn)為一個(gè)相對(duì)海退(陸坡-濱淺海)的沉積過(guò)程。上白堊統(tǒng)沉積主要河流相的漫灘平原夾河道沉積,局部含漫灘湖泊沉積,為干旱蒸發(fā)瀉湖環(huán)境。最后,根據(jù)對(duì)過(guò)井的二維測(cè)線剖面井震結(jié)合反演,以及部分靖海三維進(jìn)行虛擬井反演,分析了中生界暗色泥巖和儲(chǔ)層的特征,表明三維地震區(qū)上侏羅統(tǒng)和下白堊統(tǒng)各有厚度約150m和75m厚的純泥巖,作為生烴巖具有一定的規(guī)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.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P618.13

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