准噶尔盆地春光区块新近系沙湾组二段沉积体系研究
发布时间：2019-05-26 21:25
【摘要】：沉积体系是成因上相关的沉积环境和相互联系的沉积作用过程中所形成的一套三维沉积体,对油气地质、储层预测及圈闭研究等起着重要作用。车排子凸起位于准噶尔盆地西部隆起,自2005年2月排2井在新近系沙湾组钻遇高产工业油流以来,沙湾组已发现多个岩性油气藏,建成了春光油田。但之后部署的多口井相继失利或没达到理想效果,究其原因,主要是对该地区的砂体特征、地层关系以及沉积体系等不够了解,缺乏地震资料与地质规律的有效结合。针对上述现象及问题,本文选取春光区块沙湾组二段为例,以层序地层学、地震地层学和沉积学等理论为指导,以测井、钻井和地震资料为基础,对区块内沉积体系进行相关研究,主要包括等时层序地层格架建立、砂体识别与展布分析、沉积体系研究等内容。通过研究,主要取得以下进展和认识:(1)沙湾组二段为一个完整的水进-水退三级层序,以由陆上不整合面和最大水退面组成的复合面为层序界面,内部发育最大湖泛面,该面之下为水进体系域,沉积体呈退积形式堆砌;之上为水退体系域,沉积体呈进积形式堆砌。(2)研究区内沙二段中砂岩多为Ⅰ类砂岩,砂体单层厚度较小(多小于10m),在地震剖面上一般显示为右下倾斜对称波形(负极性),振幅自中心向两侧尖灭处逐渐减弱直至消失。(3)沙二段共发育九套砂层组,前三套发育于水进体系域中,西北部砂体呈扇形;南部或东南部砂体整体呈条带状,单个砂体呈条形或扇形。后六套砂层组形成于水退期间,前期砂层组整体呈条带状,后期砂体整体呈片状;第七到第九套砂层组只存在于工区的南部区域。(4)研究区分为凸起、滨浅湖、和半深-深湖沉积构造单元。主要发育辫状河三角洲、滩坝和水下扇三种沉积相。辫状河三角洲分布在研究区北部,滩坝分布在中部,而水下扇多分布在南部水体较深区域。区域内物源来自北部凸起构造高位,水进时期主要是北西向物源;水退时期增加了北(东)向的沉积物供给。(5)研究区在沙二段时期为辫状河三角洲-湖泊沉积体系,前者发育在陆地到湖泊的过渡地带;后者完全发育于湖泊中,包括滩坝和水下扇等沉积类型。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2485645
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
【参考文献】
相关期刊论文 前8条
1 吴因业;朱如凯;罗平;袁选俊;候连华;张天舒;;沉积学与层序地层学研究新进展——第18届国际沉积学大会综述[J];沉积学报;2011年01期
2 胡宗全;准噶尔盆地西北缘车排子地区油气成藏模式[J];断块油气田;2004年01期
3 赵晓东;向奎;叶光辉;杨少春;张世奇;陈宁宁;;准噶尔盆地车排子地区新近系沙湾组层序地层格架分析[J];科技导报;2010年12期
4 陶麟;;准噶尔盆地车排子地区沙湾组沉积特征分析[J];内江科技;2010年05期
5 马沛东;;准噶尔盆地车排子地区上第三系砂体识别方法[J];石油物探;2006年05期
6 罗劲;庄新明;韩祥磊;;准噶尔盆地车排子凸起沙湾组成藏主控因素[J];新疆石油地质;2008年01期
7 曲国胜;马宗晋;陈新发;李涛;张宁;;论准噶尔盆地构造及其演化[J];新疆石油地质;2009年01期
8 王军;;准噶尔盆地车排子地区新近系沙湾组沉积特征[J];油气地质与采收率;2013年04期
，本文编号：2485645
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2485645.html
