白云凹陷北坡珠江組沉積體系分析
發(fā)布時(shí)間：2018-08-28 08:12
【摘要】：位于珠江口盆地南部的白云凹陷油氣資源十分充沛,儲集條件很好,同時(shí)具有良好的運(yùn)聚匹配條件及保存條件,因此白云凹陷及其周邊地區(qū)具有非常良好的油氣成藏條件,是最具有潛力的勘探區(qū)域之一。其中白云凹陷內(nèi)珠江組地層每個(gè)層段中都勘探出油氣,因此本文選取白云凹陷北坡珠江組為研究對象,這為今后整個(gè)珠江口盆地的砂體分布、有利區(qū)塊的劃分以及隱蔽油氣藏的勘探起到指導(dǎo)意義。本文以層序地層學(xué)、沉積學(xué)及地震沉積學(xué)理論為依據(jù),綜合運(yùn)用各種信息及資料,通過分析與預(yù)測相結(jié)合,在建立白云凹陷北坡珠江組等時(shí)地層格架的基礎(chǔ)上,在等時(shí)地層格架內(nèi)對每個(gè)層序的平面沉積體系展布及沉積演化規(guī)律研究之后,最后確定沉積相模式。第一步,對巖心資料的分析及觀察之后,共劃分出了12種巖石相并劃分出7種主要的巖石相組合。然后在此基礎(chǔ)上綜合考慮測井資料等分析了該區(qū)的單井沉積相。認(rèn)為白云凹陷北坡珠江組沉積體系主要發(fā)育3種沉積相、3種沉積亞相及7種沉積微相,同時(shí),總結(jié)了白云凹陷北坡珠江組的測井相及測井響應(yīng)特征。其次,本論文參考IODP1148站與珠江口盆地的可對比性,借助其連續(xù)取心的優(yōu)勢,客觀的的反映出漸新世-中新世的海平面變化,為白云凹陷北坡珠江組層序地層研究起到了指導(dǎo)作用。同時(shí)綜合考慮區(qū)域內(nèi)地球化學(xué)資料、古生物資料和全球氣候的變化,結(jié)合整個(gè)珠江口盆地十七萬平方公里的地震資料,尋找上超、頂超、削截等不整合特征與單井所劃分的層序和體系域進(jìn)行結(jié)合,共識別出六個(gè)三級層序界面,以及五個(gè)三級層序。通過由點(diǎn)(單井)一線(連井)一面(平面)的方式,在層序地層格架內(nèi),對白云凹陷北坡珠江組沉積體系組合分析,研究了沉積體系時(shí)空分布演化特征。研究認(rèn)為NSQl:23.8-21Ma層序發(fā)育時(shí)期,南部番禺低突起以南至白云凹陷可見小面積的斜交前積反射特征,反映了前積式的三角洲沉積。由于高位時(shí)相對海平面下降速率極大,陸架邊緣三角洲發(fā)育。在番禺低隆起以南,白云凹陷北坡,發(fā)育低位盆底扇、斜坡扇及前積楔狀體(低位三角洲)。NSQ2:21-18.5Ma在白云凹陷北坡PY34.PY35井區(qū)附近均發(fā)育有低位楔狀體—低位三角洲砂體,及海侵三角洲砂體。NSQ3:18Ma-17.5Ma時(shí)期,相對海平面下降速率較小,由于近源區(qū)截留,物源供應(yīng)不充分,陸架邊緣三角洲不發(fā)育,高位雖有前積反射特征,但以富泥沉積為主,陸架邊緣三角洲不發(fā)育。NSQ4:17.5-17Ma此時(shí)沉積主要以淺海-半深海沉積為主,層序主要沉積海相泥巖。NSQ5:17-16.5Ma層序則砂巖明顯增多。地震反射同相軸多以平行亞平行居多—陸架邊緣三角洲發(fā)育。最后,對沉積體系砂體平面展布和內(nèi)部構(gòu)成特征進(jìn)行精細(xì)刻畫,總結(jié)出白云凹陷北坡珠江組沉積體系組合的沉積模式。預(yù)測白云凹陷北坡珠江組沉積體系組合的有利相帶,認(rèn)為NSQ1三角洲前緣河口砂壩、遠(yuǎn)砂壩或席狀砂沉積,是由于海平面的上升。該類有利區(qū)由三角洲前緣過渡到淺海陸棚相。三角洲前緣發(fā)育有較且物性較好的砂巖,為良好的儲集體,而淺海陸棚的泥巖則是極好的蓋層。NSQ2層序一方面為三角洲前緣的沉積,其相序疊置關(guān)系和巖性變化特征與NSQ1相似,所不同的其發(fā)育范圍明顯增加,這是由于海平面逐漸上升的結(jié)果；另一方面有利區(qū)域內(nèi)的儲集層是發(fā)育在厚層海相泥巖中的重力流沉積,該類型廣泛分布在陸架坡折帶上,其儲集物性好,且由于是發(fā)育在厚層泥巖中,儲蓋組合較為有利。NSQ3時(shí)期有利區(qū)的儲集層是前期沉積的三角洲前緣砂體受后期潮流作用的改造而重新沉積的潮汐砂脊(或陸架砂脊)。NSQ4時(shí)期該時(shí)期的有利區(qū)域與前一層序基本一致。略有不同的是隨著海平面逐漸的下降,三角洲與陸棚交互區(qū)以及濱岸與陸棚交互區(qū)略微向南偏移。NSQ5時(shí)期隨著海平面的持續(xù)下降和碳酸鹽臺地的逐漸萎縮,在17.1-16.5Ma時(shí)期,三角洲與陸棚的交互帶為有利區(qū)域。
[Abstract]:Baiyun sag, located in the south of Pearl River Mouth Basin, has abundant oil and gas resources, good reservoir conditions, good migration and accumulation matching conditions and preservation conditions. Therefore, Baiyun sag and its surrounding areas have very good oil and gas accumulation conditions, which is one of the most potential exploration areas. The Pearl River Formation on the northern slope of Baiyun Depression is selected as the research object in this paper, which will guide the distribution of sand bodies, the division of favorable blocks and the exploration of subtle reservoirs in the whole Pearl River Mouth Basin in the future. Based on the isochronal stratigraphic framework of the Pearl River Formation on the northern slope of Baiyun Sag, the distribution of the planar sedimentary system and the law of sedimentary evolution of each sequence are studied in the isochronal stratigraphic framework. Finally, the sedimentary facies model is determined. The first step is to divide the core data after analysis and observation. On this basis, the sedimentary facies of the single well in this area are analyzed comprehensively considering logging data. It is considered that the sedimentary system of the Pearl River Formation in the northern slope of Baiyun Sag mainly develops three sedimentary facies, three sedimentary subfacies and seven sedimentary microfacies. At the same time, the survey of the Pearl River Formation in the northern slope of Baiyun Sag is summarized. Secondly, this paper objectively reflects the Oligocene-Miocene sea-level changes by referring to the comparability between IODP 1148 and Pearl River Mouth Basin and by virtue of its advantages of continuous coring, which plays a guiding role in the sequence stratigraphic study of the Pearl River Formation on the northern slope of Baiyun Sag. According to the data, palaeobiological data and global climate change, combined with the seismic data of 170,000 square kilometers in the whole Pearl River Estuary Basin, the unconformity characteristics such as super, super-top and truncation are searched and combined with the sequence and system tract divided by single well. Six third-order sequence boundaries and five third-order sequences are identified. In the sequence stratigraphic framework, the temporal and spatial distribution and evolution characteristics of the sedimentary system in the Pearl River Formation on the northern slope of the Baiyun Sag are studied. The delta deposits are developed on the continental shelf margin due to the great rate of relative sea-level decline at high altitudes. In the south of Panyu low uplift and the north slope of Baiyun sag, there are low-lying basin floor fan, slope fan and fore-cumulus wedge (low-lying delta). NSQ2:21-18.5Ma, there are low-lying wedge-low-lying wedge bodies near the PY34.PY35 well area on the northern slope of Baiyun sag. Delta sandbodies and transgressive Delta sandbodies. In the period of NSQ3:18Ma-17.5Ma, the relative sea level declined at a relatively low rate. Due to the close source interception, the source supply was insufficient, the continental shelf margin delta was not developed, although the high position had the characteristics of pre-accumulated reflection, the main deposit was mud-rich sediments, and the continental shelf margin delta was not developed. The sequence of NSQ5:17-16.5Ma is markedly more sandstones. Most of the seismic reflection events are parallel sub-parallel with the development of the continental shelf margin delta. Sedimentary model of sedimentary system assemblage. It is predicted that the favorable facies zone of sedimentary system assemblage of Pearl River Formation on the northern slope of Baiyun Sag is attributed to the rise of sea level in the estuary bar, distal bar or sheet sand deposits in the delta front. The favorable areas transit from delta front to shallow shelf facies. The NSQ2 sequence is delta front deposit on the one hand, its facies sequence superimposition relation and lithologic change characteristics are similar to NSQ1, and its development range is obviously increased, which is due to the gradual rise of sea level; on the other hand, the favorable reservoir in the area. It is a kind of gravity current deposit developed in thick marine mudstone, which is widely distributed in shelf slope break zone. It has good reservoir property and favorable reservoir-cap assemblage because it is developed in thick mudstone. The favorable areas of the period are basically the same as the previous sequence. The slightly different is that the delta-shelf interaction area and the coastal-shelf interaction area migrate slightly southward with the gradual decrease of sea level. In the period of NSQ5, with the continuous decrease of sea level and the gradual shrinkage of carbonate platforms, the favorable areas are between 17.1 and 16. In the period of 5Ma, the interaction zone between Delta and continental shelf is favorable area.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
本文編號：2208808
[Abstract]:Baiyun sag, located in the south of Pearl River Mouth Basin, has abundant oil and gas resources, good reservoir conditions, good migration and accumulation matching conditions and preservation conditions. Therefore, Baiyun sag and its surrounding areas have very good oil and gas accumulation conditions, which is one of the most potential exploration areas. The Pearl River Formation on the northern slope of Baiyun Depression is selected as the research object in this paper, which will guide the distribution of sand bodies, the division of favorable blocks and the exploration of subtle reservoirs in the whole Pearl River Mouth Basin in the future. Based on the isochronal stratigraphic framework of the Pearl River Formation on the northern slope of Baiyun Sag, the distribution of the planar sedimentary system and the law of sedimentary evolution of each sequence are studied in the isochronal stratigraphic framework. Finally, the sedimentary facies model is determined. The first step is to divide the core data after analysis and observation. On this basis, the sedimentary facies of the single well in this area are analyzed comprehensively considering logging data. It is considered that the sedimentary system of the Pearl River Formation in the northern slope of Baiyun Sag mainly develops three sedimentary facies, three sedimentary subfacies and seven sedimentary microfacies. At the same time, the survey of the Pearl River Formation in the northern slope of Baiyun Sag is summarized. Secondly, this paper objectively reflects the Oligocene-Miocene sea-level changes by referring to the comparability between IODP 1148 and Pearl River Mouth Basin and by virtue of its advantages of continuous coring, which plays a guiding role in the sequence stratigraphic study of the Pearl River Formation on the northern slope of Baiyun Sag. According to the data, palaeobiological data and global climate change, combined with the seismic data of 170,000 square kilometers in the whole Pearl River Estuary Basin, the unconformity characteristics such as super, super-top and truncation are searched and combined with the sequence and system tract divided by single well. Six third-order sequence boundaries and five third-order sequences are identified. In the sequence stratigraphic framework, the temporal and spatial distribution and evolution characteristics of the sedimentary system in the Pearl River Formation on the northern slope of the Baiyun Sag are studied. The delta deposits are developed on the continental shelf margin due to the great rate of relative sea-level decline at high altitudes. In the south of Panyu low uplift and the north slope of Baiyun sag, there are low-lying basin floor fan, slope fan and fore-cumulus wedge (low-lying delta). NSQ2:21-18.5Ma, there are low-lying wedge-low-lying wedge bodies near the PY34.PY35 well area on the northern slope of Baiyun sag. Delta sandbodies and transgressive Delta sandbodies. In the period of NSQ3:18Ma-17.5Ma, the relative sea level declined at a relatively low rate. Due to the close source interception, the source supply was insufficient, the continental shelf margin delta was not developed, although the high position had the characteristics of pre-accumulated reflection, the main deposit was mud-rich sediments, and the continental shelf margin delta was not developed. The sequence of NSQ5:17-16.5Ma is markedly more sandstones. Most of the seismic reflection events are parallel sub-parallel with the development of the continental shelf margin delta. Sedimentary model of sedimentary system assemblage. It is predicted that the favorable facies zone of sedimentary system assemblage of Pearl River Formation on the northern slope of Baiyun Sag is attributed to the rise of sea level in the estuary bar, distal bar or sheet sand deposits in the delta front. The favorable areas transit from delta front to shallow shelf facies. The NSQ2 sequence is delta front deposit on the one hand, its facies sequence superimposition relation and lithologic change characteristics are similar to NSQ1, and its development range is obviously increased, which is due to the gradual rise of sea level; on the other hand, the favorable reservoir in the area. It is a kind of gravity current deposit developed in thick marine mudstone, which is widely distributed in shelf slope break zone. It has good reservoir property and favorable reservoir-cap assemblage because it is developed in thick mudstone. The favorable areas of the period are basically the same as the previous sequence. The slightly different is that the delta-shelf interaction area and the coastal-shelf interaction area migrate slightly southward with the gradual decrease of sea level. In the period of NSQ5, with the continuous decrease of sea level and the gradual shrinkage of carbonate platforms, the favorable areas are between 17.1 and 16. In the period of 5Ma, the interaction zone between Delta and continental shelf is favorable area.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13
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