【摘要】：沉積體系是成因上相關(guān)的沉積環(huán)境和相互聯(lián)系的沉積作用過程中所形成的一套三維沉積體,對油氣地質(zhì)、儲層預(yù)測及圈閉研究等起著重要作用。車排子凸起位于準(zhǔn)噶爾盆地西部隆起,自2005年2月排2井在新近系沙灣組鉆遇高產(chǎn)工業(yè)油流以來,沙灣組已發(fā)現(xiàn)多個(gè)巖性油氣藏,建成了春光油田。但之后部署的多口井相繼失利或沒達(dá)到理想效果,究其原因,主要是對該地區(qū)的砂體特征、地層關(guān)系以及沉積體系等不夠了解,缺乏地震資料與地質(zhì)規(guī)律的有效結(jié)合。針對上述現(xiàn)象及問題,本文選取春光區(qū)塊沙灣組二段為例,以層序地層學(xué)、地震地層學(xué)和沉積學(xué)等理論為指導(dǎo),以測井、鉆井和地震資料為基礎(chǔ),對區(qū)塊內(nèi)沉積體系進(jìn)行相關(guān)研究,主要包括等時(shí)層序地層格架建立、砂體識別與展布分析、沉積體系研究等內(nèi)容。通過研究,主要取得以下進(jìn)展和認(rèn)識:(1)沙灣組二段為一個(gè)完整的水進(jìn)-水退三級層序,以由陸上不整合面和最大水退面組成的復(fù)合面為層序界面,內(nèi)部發(fā)育最大湖泛面,該面之下為水進(jìn)體系域,沉積體呈退積形式堆砌;之上為水退體系域,沉積體呈進(jìn)積形式堆砌。(2)研究區(qū)內(nèi)沙二段中砂巖多為Ⅰ類砂巖,砂體單層厚度較小(多小于10m),在地震剖面上一般顯示為右下傾斜對稱波形(負(fù)極性),振幅自中心向兩側(cè)尖滅處逐漸減弱直至消失。(3)沙二段共發(fā)育九套砂層組,前三套發(fā)育于水進(jìn)體系域中,西北部砂體呈扇形;南部或東南部砂體整體呈條帶狀,單個(gè)砂體呈條形或扇形。后六套砂層組形成于水退期間,前期砂層組整體呈條帶狀,后期砂體整體呈片狀;第七到第九套砂層組只存在于工區(qū)的南部區(qū)域。(4)研究區(qū)分為凸起、濱淺湖、和半深-深湖沉積構(gòu)造單元。主要發(fā)育辮狀河三角洲、灘壩和水下扇三種沉積相。辮狀河三角洲分布在研究區(qū)北部,灘壩分布在中部,而水下扇多分布在南部水體較深區(qū)域。區(qū)域內(nèi)物源來自北部凸起構(gòu)造高位,水進(jìn)時(shí)期主要是北西向物源;水退時(shí)期增加了北(東)向的沉積物供給。(5)研究區(qū)在沙二段時(shí)期為辮狀河三角洲-湖泊沉積體系,前者發(fā)育在陸地到湖泊的過渡地帶;后者完全發(fā)育于湖泊中,包括灘壩和水下扇等沉積類型。
[Abstract]:Sedimentary system is a set of three-dimensional sedimentary bodies formed in the process of related sedimentary environment and interrelated sedimentation, which plays an important role in oil and gas geology, reservoir prediction and trap research. The Chapaizi uplift is located in the western uplift of Junggar Basin. Since the high-yield industrial oil flow was drilled in the Neogene Shawan formation in February 2005, many lithologic reservoirs have been discovered in Shawan formation, and Chunguang Oilfield has been established. However, the failure or failure of many wells after deployment is mainly due to the lack of understanding of the characteristics of sand bodies, formation relations and sedimentary systems in this area, and the lack of effective combination of seismic data and geological laws. In view of the above phenomena and problems, this paper takes the second member of Shawan formation in Chunguang block as an example, guided by sequence stratigraphy, seismic stratigraphy and sedimentology, and based on logging, drilling and seismic data. The sedimentary system in the block is studied, including the establishment of isochronous sequence stratigraphy framework, sand body identification and distribution analysis, sedimentary system research and so on. Through the study, the following progress and understanding have been made: (1) the second member of Shawan formation is a complete three-stage sequence of water advance and water retreat, with the composite surface composed of land unconformity surface and maximum water retreat surface as sequence interface, and the largest lake flooding surface developed internally. Under this surface, the water enters the system tract, and the sedimentary body is stacked in the form of retrogression. The sedimentary bodies are stacked in the form of progressive accumulation. (2) most of the sandstone in the second member of the study area is type I sandstone, and the single layer thickness of the sand body is small (mostly less than 10m). On the seismic profile, the symmetrical waveform (negative polarity) of the right lower tilt is generally shown, and the amplitude gradually weakens and disappears from the center to both sides. (3) Nine sets of sand layer groups are developed in the second member of Shahejie formation, and the first three sets are developed in the system tract of water entry. The sand bodies in the northwest are fan-shaped. The southern or southeast sand bodies are banded as a whole, and the single sand bodies are strip or fan-shaped. The latter six sets of sand formation were formed during the period of water retreat, the sand layer group in the early stage was banded, and the sand body in the later stage was flake as a whole. The seventh to ninth sets of sand formation only exist in the southern part of the working area. (4) the study area is divided into uplift, shallow lake, and semi-deep-deep lake sedimentary tectonic units. Braided river deltas, beach bars and underwater fans are mainly developed. Braided river deltas are distributed in the north of the study area, beaches and dams are distributed in the middle of the study area, while underwater fans are mostly distributed in the deeper water bodies in the south of the study area. The provenance in the region comes from the high protruding structure in the north, and the water advance period is mainly the northwest provenance. The water retreat period increased the north (east) sediment supply. (5) in the second member of Shahejie formation, the study area was a braided river Delta-lacustrine sedimentary system, the former developed in the transitional zone from land to lake; The latter is completely developed in lakes, including beach dams and underwater fans.
【學(xué)位授予單位】：成都理工大學(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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