南堡3號(hào)構(gòu)造古近系層序地層格架及其演化研究
發(fā)布時(shí)間：2018-08-11 12:44
【摘要】：南堡3號(hào)構(gòu)造位于南堡凹陷東南部,古近系以三角洲前緣和濱淺湖沉積為主,層序劃分方案混亂,層序沉積充填過(guò)程不明確,沙河街組一段油藏分布規(guī)律不清。本文針對(duì)這些問(wèn)題,以南堡3號(hào)構(gòu)造古近系為研究對(duì)象,東營(yíng)組二段—沙河街組一段為重點(diǎn)研究層段,綜合巖心、鉆測(cè)井、地震和分析化驗(yàn)等資料,開(kāi)展了層序地層學(xué)及沉積學(xué)研究,建立了研究區(qū)等時(shí)層序地層格架,分析了研究區(qū)緩坡帶層序地層特點(diǎn)及其控制因素、沉積充填演化特征以及層序地層格架與油氣分布關(guān)系,為下一步油氣勘探開(kāi)發(fā)工作提供科學(xué)依據(jù)。主要取得了以下成果及認(rèn)識(shí):(1)在南堡3號(hào)構(gòu)造古近系中識(shí)別了4個(gè)二級(jí)層序界面,9個(gè)三級(jí)層序界面,分為8個(gè)三級(jí)層序。其中SQ3-SQ7分為11個(gè)體系域,SQ5進(jìn)一步分為4個(gè)準(zhǔn)層序,SQ4湖退域分為2個(gè)準(zhǔn)層序,建立了南堡3號(hào)構(gòu)造古近系層序地層格架。(2)分析了古近系層序界面特點(diǎn),闡明了各層序及其體系域發(fā)育特征。層序厚度由南西至北東方向總體呈增厚趨勢(shì),由北西至南東方向顯示地層總體呈厚—薄—厚的發(fā)育特征,各體系域的沉積厚度分布受控于盆地邊緣類型、構(gòu)造活動(dòng)、沉積物源等多種因素。(3)證實(shí)了研究區(qū)物源來(lái)自西南方向沙壘田凸起,古近系發(fā)育了四種沉積相:扇三角洲、辮狀河三角洲、濱淺湖和深水滑塌濁積扇。其中扇三角洲—濱淺湖沉積主要出現(xiàn)在SQ1和SQ2中,辮狀河三角洲—濱淺湖/濁積沉積主要出現(xiàn)在SQ3-SQ7中。(4)認(rèn)為研究區(qū)控制層序發(fā)育主要因素為構(gòu)造沉降、古氣候和沉積物供給。歸納了沉積充填的層序結(jié)構(gòu)樣式有TSTRST(或HST)、TST=RST(或HST)、TSTRST(或HST)三種。建立了2種類型層序充填模式:無(wú)坡折帶層序充填模式和具坡折帶的層序充填模式,其中無(wú)坡折帶層序充填模式為研究區(qū)主要層序充填模式。(5)指出研究區(qū)受層序地層格架影響的油氣藏有3類:砂巖透鏡體油氣藏、砂巖上傾尖滅油氣藏和構(gòu)造—巖性油氣藏�？偨Y(jié)了巖性油氣藏主要位于低位域的濁積扇體,湖侵域的濁積砂體或湖退域的單一的辮狀河三角洲前緣水下分流河道砂體中。
[Abstract]:Nanbao No. 3 structure is located in the southeast of Nanpu depression. The Paleogene is dominated by delta front and littoral lake deposits. The sequence division scheme is chaotic, the sequence sedimentary filling process is not clear, and the reservoir distribution law of the first member of Shahejie formation is unclear. In this paper, the Paleogene of Nanbao No. 3 structure is taken as the research object, the section of the second stage of Dongying formation and the first member of Shahejie formation is taken as the focus of the study, the comprehensive core, drilling logging, seismic and analytical data are studied. In this paper, sequence stratigraphy and sedimentology are studied. The isochronous sequence stratigraphic framework is established in the study area. The characteristics of sequence stratigraphy in gentle slope zone and its controlling factors, the characteristics of sedimentary filling evolution and the relationship between sequence stratigraphic framework and oil and gas distribution are analyzed. To provide scientific basis for the next step of oil and gas exploration and development. The main achievements and understandings are as follows: (1) four second-order sequence interfaces and nine third-order sequence interfaces have been identified in the Paleogene system of Nanpu No. 3 structure, which are divided into eight third-order sequences. Among them, SQ3-SQ7 is divided into 11 system tracts and SQ5 is further divided into 4 quasequence and SQ4 lake regression. The sequence stratigraphic framework of Paleogene in Nanpu No. 3 structure is established. (2) the characteristics of Paleogene sequence interface are analyzed. The developmental characteristics of each sequence and its system tracts are expounded. The thickness of sequence shows an overall thickening trend from the south west to the north east direction, and from the north west to the south east direction shows that the strata are generally thick-thin-thick. The sedimentary thickness distribution of each system tract is controlled by the basin margin type and the tectonic activity, the sedimentary thickness distribution of each system tract is controlled by the type of the basin margin and the tectonic activity. (3) it is confirmed that the provenance of the studied area came from the uplift of the sand barrier field in the southwest direction, and four sedimentary facies were developed in the Paleogene: fan delta, braided river delta, shallow shore lake and deep water sloughing turbidite fan. Fan delta-shore-shallow lake deposits mainly occur in SQ1 and SQ2, and braided river delta-shore-shallow lake / turbidite deposits mainly occur in SQ3-SQ7. (4) it is considered that the main factors controlling sequence development in the study area are tectonic subsidence, paleoclimate and sediment supply. Three types of sequence structure styles of sedimentary filling are summarized: TSTRST (or HST) TST (or HST) TSTRST (or HST). Two types of sequence filling models are established: sequence filling model without slope break zone and sequence filling model with slope break zone. The sequence filling model without slope break zone is the main sequence filling model in the study area. (5) it is pointed out that there are three types of oil and gas reservoirs affected by sequence stratigraphic framework in the study area: sandstone lens reservoir, sandstone updip tip-out reservoir and structure-lithologic reservoir. The lithologic reservoirs are mainly located in the turbidite fan body in the low position, the turbidite sand body in the lake transgression area or the single braided river delta front underwater distributary channel sand body in the receding area.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13
[Abstract]:Nanbao No. 3 structure is located in the southeast of Nanpu depression. The Paleogene is dominated by delta front and littoral lake deposits. The sequence division scheme is chaotic, the sequence sedimentary filling process is not clear, and the reservoir distribution law of the first member of Shahejie formation is unclear. In this paper, the Paleogene of Nanbao No. 3 structure is taken as the research object, the section of the second stage of Dongying formation and the first member of Shahejie formation is taken as the focus of the study, the comprehensive core, drilling logging, seismic and analytical data are studied. In this paper, sequence stratigraphy and sedimentology are studied. The isochronous sequence stratigraphic framework is established in the study area. The characteristics of sequence stratigraphy in gentle slope zone and its controlling factors, the characteristics of sedimentary filling evolution and the relationship between sequence stratigraphic framework and oil and gas distribution are analyzed. To provide scientific basis for the next step of oil and gas exploration and development. The main achievements and understandings are as follows: (1) four second-order sequence interfaces and nine third-order sequence interfaces have been identified in the Paleogene system of Nanpu No. 3 structure, which are divided into eight third-order sequences. Among them, SQ3-SQ7 is divided into 11 system tracts and SQ5 is further divided into 4 quasequence and SQ4 lake regression. The sequence stratigraphic framework of Paleogene in Nanpu No. 3 structure is established. (2) the characteristics of Paleogene sequence interface are analyzed. The developmental characteristics of each sequence and its system tracts are expounded. The thickness of sequence shows an overall thickening trend from the south west to the north east direction, and from the north west to the south east direction shows that the strata are generally thick-thin-thick. The sedimentary thickness distribution of each system tract is controlled by the basin margin type and the tectonic activity, the sedimentary thickness distribution of each system tract is controlled by the type of the basin margin and the tectonic activity. (3) it is confirmed that the provenance of the studied area came from the uplift of the sand barrier field in the southwest direction, and four sedimentary facies were developed in the Paleogene: fan delta, braided river delta, shallow shore lake and deep water sloughing turbidite fan. Fan delta-shore-shallow lake deposits mainly occur in SQ1 and SQ2, and braided river delta-shore-shallow lake / turbidite deposits mainly occur in SQ3-SQ7. (4) it is considered that the main factors controlling sequence development in the study area are tectonic subsidence, paleoclimate and sediment supply. Three types of sequence structure styles of sedimentary filling are summarized: TSTRST (or HST) TST (or HST) TSTRST (or HST). Two types of sequence filling models are established: sequence filling model without slope break zone and sequence filling model with slope break zone. The sequence filling model without slope break zone is the main sequence filling model in the study area. (5) it is pointed out that there are three types of oil and gas reservoirs affected by sequence stratigraphic framework in the study area: sandstone lens reservoir, sandstone updip tip-out reservoir and structure-lithologic reservoir. The lithologic reservoirs are mainly located in the turbidite fan body in the low position, the turbidite sand body in the lake transgression area or the single braided river delta front underwater distributary channel sand body in the receding area.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【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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