塔里木盆地中央隆起帶志留系柯坪塔格組層序地層格架內(nèi)砂體時(shí)空分布規(guī)律研究
本文選題:中央隆起帶 + 柯坪塔格組。 參考:《成都理工大學(xué)》2015年碩士論文
【摘要】:本論文以塔里木盆地中央隆起帶志留系柯坪塔格組為研究對(duì)象,以沉積學(xué)、層序地層學(xué)和儲(chǔ)層地質(zhì)學(xué)等多學(xué)科理論為指導(dǎo),在區(qū)域構(gòu)造背景的基礎(chǔ)上,宏觀分析與微觀研究相結(jié)合,按照地層演化-層序演化-沉積演化的研究思路,運(yùn)用巖心、鉆井、測(cè)井、地震等多種方法相結(jié)合,劃分單井層序地層,并進(jìn)行了對(duì)比,建立了層序地層格架。進(jìn)而研究了層序地層格架內(nèi)柯坪塔格組沉積期沉積相類型特征及沉積相平面展布和垂向演化規(guī)律,在上述基礎(chǔ)上深入分析了柯坪塔格組層序格架內(nèi)砂體時(shí)空分布規(guī)律。在區(qū)域構(gòu)造演化特征分析基礎(chǔ)上,建立了柯坪塔格組地層劃分方案,并對(duì)不同區(qū)域的地層展開(kāi)了對(duì)比研究,將研究區(qū)柯坪塔格組劃分為3個(gè)段和7個(gè)亞段。充分利用野外露頭資料、鉆井資料、地震資料,對(duì)中央隆起帶志留系柯坪塔格組開(kāi)展了層序地層學(xué)研究,劃分為1個(gè)不完整的二級(jí)層序(SSQ1),3個(gè)完整的三級(jí)層序(SQ1-SQ3)和1個(gè)不完整的三級(jí)層序(SQ4)。在進(jìn)行單井層序特征研究、井間層序地層對(duì)比的基礎(chǔ)上,建立了層序地層格架。充分利用前人資料,結(jié)合盆地周緣野外剖面、鉆井巖心資料、測(cè)井資料和室內(nèi)測(cè)試分析資料,在沉積相標(biāo)志研究的基礎(chǔ)上,根據(jù)巖石組合、沉積構(gòu)造、剖面特征和演化序列,對(duì)研究區(qū)志留系柯坪塔格組沉積相類型及特征進(jìn)行了系統(tǒng)研究,識(shí)別出潮坪相、陸棚相、三角洲相三個(gè)沉積相類型。其中潮坪相進(jìn)一步劃分為潮上、潮間、潮下亞相,陸棚相劃分為淺海陸棚亞相,三角洲相劃分為三角洲平原亞相、三角洲前緣亞相、前三角洲亞相,進(jìn)而對(duì)柯坪塔格組不同亞段沉積期沉積相平面分布特征進(jìn)行了分析,建立了柯坪塔格組潮坪-陸棚相沉積模式。綜合地層、層序和沉積三方面研究成果,深入分析志留系柯坪塔格組砂體時(shí)空分布規(guī)律在平面上呈北厚南薄、東厚西薄,結(jié)構(gòu)成熟度北高南低,東高西低,在沉積演化過(guò)程中,砂體呈早期薄,晚期厚,結(jié)構(gòu)成熟度早期低,晚期高的特點(diǎn)。
[Abstract]:This paper takes the Silurian Kepingtag formation in the central uplift belt of the Tarim Basin as the research object, and based on the multi-disciplinary theories of sedimentology, sequence stratigraphy and reservoir geology, and on the basis of the regional tectonic background, Combining macro analysis with micro research, according to the research ideas of stratigraphic evolution-sequence evolvement and sedimentary evolution, combining with core, drilling, logging, seismic and other methods, the single well sequence stratigraphy is divided and compared. The sequence stratigraphic framework is established. Furthermore, the characteristics of sedimentary facies types and the distribution and vertical evolution of sedimentary facies in the Kepingtag formation in sequence stratigraphy framework are studied. On the basis of the above, the temporal and spatial distribution of sand bodies in the sequence framework of the Kepingtag formation are deeply analyzed. Based on the analysis of the characteristics of regional tectonic evolution, the stratigraphic division scheme of Kepingtag formation is established, and the stratigraphic correlation of different regions is studied. The Kepingtag formation is divided into three sections and seven subsections. Taking full advantage of outcrop data, drilling data and seismic data, the sequence stratigraphy of the Silurian Kepingtag formation in the central uplift zone has been studied. It is divided into 1 incomplete secondary sequence SSQ1, 3 complete tertiary sequence SQ1-SQ3) and 1 incomplete third order sequence SQ4. Based on the study of single well sequence characteristics and interwell sequence stratigraphic correlation, a sequence stratigraphic framework is established. Making full use of the previous data, combining with the field profile of the margin of the basin, drilling core data, logging data and laboratory test analysis data, on the basis of the study of sedimentary facies markers, according to the rock assemblage, sedimentary structure, profile characteristics and evolution sequence, The types and characteristics of sedimentary facies of Kepingtag formation of Silurian in the study area were systematically studied and three types of sedimentary facies including tidal flat facies continental shelf facies and delta facies were identified. The tidal flat facies are further divided into upper tide, intertidal, subtidal subfacies, shelf facies, shallow sea shelf subfacies, delta facies as delta plain subfacies, delta front subfacies, pre delta subfacies. The distribution characteristics of sedimentary facies in different submember of Kepingtag formation are analyzed, and the sedimentary model of tidal flat and shelf facies of Kepingtag formation is established. Synthesizing the research results of stratigraphy, sequence and sedimentation, the spatiotemporal distribution law of sand body of Kepingtag formation of Silurian is analyzed in depth. In the process of sedimentary evolution, the distribution of sand body in the plane is thick in the north, thick in the east, low in the north, low in the south, low in the east and low in the west. The sand body is thin in early stage, thick in late stage, low in structure maturity early and high in late stage.
【學(xué)位授予單位】:成都理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:P618.13
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