临南油田夏52断块沙三上段沉积微相研究

以岩心和测井资料为基础，对夏52断块沙三上段进行沉积微相研究。认为研究区为三角洲沉积体系下的三角洲前缘亚相、三角洲平原亚相。三角洲平原亚相发育分流河道、分流河道间湾、决口扇和决口水道4种微相；三角洲前缘亚相发育河口砂坝、前缘席状砂和水下水道3种微相。分析揭示了沉积微相展布特征及演化规律，指出了勘探开发的有利相带。     

临南油田夏52断块沙三上段沉积微相研究

以岩心和测井资料为基础,对夏52断块沙三上段进行沉积微相研究.认为研究区为三角洲沉积体系下的三角洲前缘亚相、三角洲平原亚相.三角洲平原亚相发育分流河道、分流河道间湾、决口扇和决口水道4种微相;三角洲前缘亚相发育河口砂坝、前缘席状砂和水下水道3种微相.分析揭示了沉积微相展布特征及演化规律,指出了勘探开发的有利相带.     

惠民凹陷临南地区古近系沙三下亚段沉积特征

惠民凹陷临南地区古近系沙三下亚段沉积相类型及砂体展布规律复杂,制约该地区进一步中深层勘探.根据岩心观察、录井、测井及地震等资料对研究区进行沉积学研究,分析各沉积微相的识别标志、沉积特征及分布规律.结果表明:临南地区古近系沙三下亚段广泛发育三角洲前缘沉积,在三角洲前缘细粒沉积的大背景下,发育下切谷充填沉积.三角洲前缘沉积主要以细粒沉积为主,划分为三角洲前缘水下分流河道、分流间湾、河口砂坝和远砂坝4种微相;下切谷充填沉积以粗粒沉积为主,划分为下切谷水道、水道天然堤和水道间漫溢3种微相.该研究成果为该地区下一步勘探提供指导.     

贝西地区南屯组扇三角洲沉积特征及地质意义

根据岩石相、地震剖面相、测井相特征并结合岩石薄片等资料,对海拉尔盆地贝尔凹陷贝西地区下白垩统南屯组内发育的沉积体系类型及特征进行了系统的研究,认为研究区南屯组主要发育扇三角洲沉积体系,识别出了扇三角洲平原、扇三角洲前缘和前三角洲三类亚相和平原分流河道、平原分流河道间、前缘水下主河道微相等11类微相,在此基础上,建立了贝尔凹陷贝西地区南屯组的扇三角洲沉积模式,对优势储集体的预测具有一定参考价值。     

克拉玛依油田一中区上克拉玛依组沉积相研究

以岩心观察、测井和生产动态资料为基础,通过对岩石组合、沉积构造、测井相分析和砂体形态等沉积相标志的分析,对克拉玛依油田一中区上克拉玛依组沉积相类型及沉积微相展布进行了研究．结果表明：一中区上克拉玛依组发育辫状河三角洲平原亚相和辫状河三角洲前缘亚相．其中,S5^2-2单层发育辫状河三角洲前缘亚相,以水下分流河道、河口坝、席状砂和三角洲前缘泥等微相为主;S5^2-1到S5^1-1单层、S4砂组和S1砂组各单层发育辫状河三角洲平原亚相,以分流河道、溢岸砂和分流间湾等微相为主．     

红旗凹陷南屯组沉积特征及优势储集相带分析

综合运用了地震、岩芯、录井、测井等方面的资料,在区域构造背景下详细地分析了红旗凹陷在南屯组沉积时期主要发育的沉积体系类型及其平面展布特征,认为研究区主要发育有扇三角洲、湖底扇及湖泊三种类型的沉积体系,其中扇三角洲沉积主要发育在西侧的红西陡坡带内,东侧缓坡带内发育范围较小,前缘砂体向前推进过程中遇断裂坡折带发生滑塌,在HS6等井区处形成湖底扇沉积体系,湖泊沉积体系主要发育在西侧陡坡带和东侧缓坡带间的洼槽区内。对不同微相类型岩芯样品的物性特征进行分析发现,扇三角洲前缘水下分流河道和湖底扇中扇辫状沟道微相物性特征好,是最有利的油气储集相带;扇三角洲平原分流河道微相次之,为较有利的油气储集相带。     

大庆油田北二西二类油层非均质性特征研究

大庆萨尔图油田北二西是为提高最终采收率和提高油田产量而进行聚驱上返的区块。利用密井网区的开发井测井资料，研究了油田开发区块储层的非均质特征，同时给出了本区二类油层的界定标准。将区块储层分成高弯曲分流沉积砂体、低弯曲分流沉积砂体、内前缘相枝状三角洲沉积砂体、内前缘相过渡三角洲沉积砂体、内前缘相坨状三角洲沉积砂体五种类型。研究了各种砂体的非均质特征。     

冀中坳陷饶阳凹陷蠡县斜坡沙一下亚段地震沉积学

冀中坳陷饶阳凹陷蠡县斜坡因富含油气而备受关注,随着勘探程度的不断提高,岩性-地层油气藏成为蠡县斜坡增储上产的主要目标,明确砂体成因类型及其分布演化规律是油气高效勘探开发的关键。综合利用岩芯、测井和三维地震资料,开展了蠡县斜坡北段沙一下亚段地震沉积学研究。依据沙一下亚段顶、底界面T4和T42地震反射标志层以及内部T43地震反射标志层,将沙一下亚段划分为尾砂岩段和特殊岩性段。浅水三角洲成因的尾砂岩段可细分为浅水三角洲平原、浅水三角洲前缘（内前缘和外前缘）及前浅水三角洲等3种亚相类型;特殊岩性段以滩坝-湖泊沉积为特征,砂体类型主要为砂质碎屑岩滩坝,碳酸盐岩滩坝次之。尾砂岩段沉积时期,浅水三角洲体系在平面上表现出明显的分带性,浅水三角洲内前缘水下分流河道砂体分布范围广,最大推进距离达15 km,是研究区的主力储层;从早到晚,伴随着湖平面逐步上升,西南部物源逐步占据主导地位,而北部物源影响范围减小。特殊岩性段沉积时期,湖平面迅速上升,浅水三角洲体系完全退出蠡县斜坡北段,沉积体系以滨浅湖—半深湖和滩坝沉积为特征,砂体类型主要为砂质碎屑岩滩坝,分布在研究区东部（面积约12 km²）,大多平行于湖岸线呈条带状展布。根据沉积学和地震沉积学研究,分别建立了研究区尾砂岩段和特殊岩性段时期的沉积模式,为下一步储层预测和油气勘探开发提供参考。     

鄂尔多斯盆地西南部庆探1井区山1段沉积特征研究

庆探1井区古水流、重矿物及砂岩组分指示沉积物源主要来自西南方向。研究区山1段主要为三角洲前缘亚相沉积,发育水下分流河道、水下天然堤、水下决口扇和水下分流河道间等4种微相,其中水下分流河道自西南向北东方向延伸展布,水下分流河道砂体是研究区主要的有效储集体,与分流河道间泥质沉积呈条带状相间分布。总体上鄂尔多斯盆地西南部山1段沉积具有浅水曲流河三角洲沉积特征。     

洪湖地区新沟嘴组沉积微相研究

洪湖地区的物源主要来自潜江凹陷东北部,发育三角洲沉积体系中三角洲前缘亚相沉积。在区域沉积相研究基础上,以取心井资料为基础,结合录井、测井等资料通过各种相标志进行比较分析,结合砂体形态、类型,确定其沉积相、微相类型,建立了沉积微相模式。首次运用单砂层沉积微相划分技术对洪湖地区进行了沉积微相研究,指出了微相类型以水下分流河道、河口坝、前缘席状砂为主,其中发育在水下分流河道的砂体为该区最有利的储集砂体,河口坝和前缘席状砂次之。     

Sedimentary facies and depositional model of shallow water delta dominated by fluvial for Chang 8 oil-bearing group of Yanchang Formation in southwestern Ordos Basin,China

A systematic analysis of southwestern Ordos Basin's sedimentary characteristics,internal architectural element association styles and depositional model was illustrated through core statistics,well logging data and outcrop observations in Chang 8 oil-bearing group.This analysis indicates that shallow water delta sediments dominated by a fluvial system is the primary sedimentary system of the Chang 8 oil-bearing group of the Yanchang Formation in southwestern Ordos Basin.Four microfacies with fine grain sizes are identified: distributary channels,sheet sandstone,mouth bar and interdistributary fines.According to the sandbody's spatial distribution and internal architecture,two types of sandbody architectural element associations are identified: amalgamated distributary channels and thin-layer lobate sandstone.In this sedimentary system,net-like distributary channels at the delta with a narrow ribbon shape compose the skeleton of the sandbody that extends further into the delta front and shades into contiguous lobate distribution sheet sandstone in the distal delta front.The mouth bar is largely absent in this system.By analyzing the palaeogeomorphology,the palaeostructure background,sedimentary characteristics,sedimentary facies types and spatial distribution of sedimentary facies during the Chang 8 period,a distinctive depositional model of the Chang 8 shallow water fluvial-dominated delta was established,which primarily consists of straight multi-phase amalgamated distributary channels in the delta plain,net-like distributary channels frequently diverting and converging in the proximal delta front,sheet sandstones with dispersing contiguous lobate shapes in the distal delta front,and prodelta or shallow lake mudstones.     

高邮凹陷古近系戴南组扇三角洲沉积体系及其沉积相模式

扇三角洲是苏北盆地高邮凹陷戴南组较为发育的一种沉积类型,集中分布在凹陷南部陡坡带一侧,是该区一个重要的勘探领域。根据岩芯、测井、地震、粒度等资料,对高邮凹陷古近系戴南组扇三角洲的沉积特征进行了研究,建立了高邮凹陷戴南组的沉积相模式。根据单井沉积相、连井沉积相分析以及地震剖面反射特征和砂地比图综合分析,确定了戴南组各亚段沉积相的平面展布,编制了戴南组各亚段沉积相分布图。结果表明:高邮凹陷南部陡坡带地形陡,存在扇三角洲发育的条件,也存在反映浅水环境的岩性特点,成分成熟度和结构成熟度低反映了近物源的条件,还发现反映牵引流和重力流共存的沉积构造特点; 从地震反射特征上看,反射结构不稳定,并发现向盆地边缘加厚的楔形地震相。在此基础上,重点对戴南组扇三角洲相各微相进行了分析,共划分出扇三角洲平原、扇三角洲前缘和前扇三角洲亚相,并进一步划分出水上分流河道、漫滩沼泽、水下分流河道、分流河道间和席状砂等微相,最后详细阐述了各微相的沉积特征。     

临南油田街2断块沙三上亚段Ⅴ砂岩组沉积微相研究

基于区域地质背景资料,综合运用岩芯观察、岩相和测井相分析等手段,对临南油田街2断块沙三上亚段Ⅴ砂岩组沉积微相的沉积相标志、类型以及展布特征进行了系统研究。结果表明:临南油田街2断块沙三上亚段Ⅴ砂岩组为一套湖泊三角洲沉积体系,亚相类型为三角洲前缘亚相;沙三上亚段Ⅴ砂岩组主要沉积微相可细分为水下分流河道、水下分流河道间湾、河口坝、远砂坝和前缘席状砂等5种微相,并建立了沉积微相识别模式;沉积特征和沉积微相的平面展布呈现在近东西向剖面上砂体连续性较好,可见河口坝与前缘席状砂的交替出现,而在近西南—北东向剖面上,砂体横向上一般由水下分流河道过渡到河口坝或前缘席状砂。总之,临南油田街2断块沙三上亚段Ⅴ砂岩组是研究区三角洲形成的高峰期,水下分流河道、河口坝、前缘席状砂为主要的储集砂体。     

断陷湖盆浅水三角洲沉积体系

浅水三角洲不仅可发育在陆相坳陷盆地,也可在断陷湖盆初始期、萎缩期和断-坳转化期发育。浅水三角洲的形成受控于古构造、古地形、古水体、古气候及古物源等因素,在岩性、沉积结构、沉积构造、测井曲线、古生物及地球物理响应等6个方面具有与其他三角洲不同的沉积特征。基于物源体系可将浅水三角洲划分为浅水扇三角洲、浅水辫状河三角洲及浅水曲流河三角洲3种类型。断陷湖盆浅水三角洲的发育具有明显的阶段性和多变性,受构造影响较大。断陷湖盆初始期,由近岸向远岸,A/S值逐渐增加,河道砂体规模变小,连通性变差,席状化程度增强,平面砂体形态由毯状、坨状过渡为朵状、带状。断陷湖盆萎缩期,A/S值较小时,发育丝带状或鸟足状三角洲,水下分流河道推进速度快,单期砂体较厚,横向变化快;A/S值较大时,多发育扇形、舌形或伞状三角洲,水下分流河道不发育,河口坝和席状砂成片出现,砂体横向较稳定,单砂体厚度不大。通过上述研究探讨了断陷湖盆浅水三角洲的发育特征和沉积模式,为完善陆相湖盆浅水三角洲理论提供依据。     

Vertical structure and dominating factors of sand body during Late Triassic Chang 9 time of Yanchang Formation in Ordos Basin,NW China

Based on a synthetic geological study of drilling, well logging and core observations, two main genetic types of Chang 9sand body in Odors Basin were recognized, which included two effects, that is, delta environment and tractive current effects that lead to the development of mouth bar, distal bar, sheet sand and other sand bodies of subaerial and subaqueous distributary channel,natural levee, flood fan and delta front, and shore-shallow lake environment and lake flow transformation effects that result in the development of sandy beach bar, sheet sand and other sand bodies. Chang 9 sand body mainly developed five basic vertical structures, namely box shape, campaniform, infundibuliform, finger and dentoid. The vertical stacking patterns of multilayer sand body was complex, and the common shapes included box shape + box shape, campaniform + campaniform, campaniform + box shape, infundibuliform + infundibuliform, campaniform + infundibuliform, box shape + campaniform, box shape + infundibuliform,and finger + finger. Based on the analysis on major dominating factors of vertical structure of sand body, sedimentary environment,sedimentary facies and rise, fall and cycle of base level are identified as the major geological factors that control the vertical structure of single sand body as well as vertical stacking patterns and distribution of multistory sand bodies.     

Effects of water level fluctuation on sedimentary characteristics and reservoir architecture of a lake,river dominated delta

The hydrodynamic conditions present in a river delta's formation are a highly important factor in the variation between its sedimentary regulation and characteristics. In the case of the lacustrine basin river-dominated delta, water level fluctuations and fluviation, are both important controlling factors of the sedimentary characteristics and reservoir architecture. To discuss the effects of water level fluctuation on sediment characteristics and reservoir architecture of this delta, the Fangniugou section in the east of the Songliao Basin was selected for study. Based on an outcrop investigation of the lacustrine basin river-dominated delta, combining with an analysis of the major and trace chemical elements in the sediments to determine the relative water depth, through architecture bounding surfaces and lithofacies division, sedimentary microfacies recognition and architectural element research, this work illustrated the effects of water level fluctuation on the reservoir architecture and established sedimentary models for the lacustrine basin river-dominated delta under various water level conditions. The results show that there are 8 lithofacies in the Fangniugou section. The fan delta front, which is the main object of this study, develops four sedimentary microfacies that include the underwater distributary channel, river mouth bar, sheet sand and interdistributary bay. The effects of water level fluctuation on different orders geographic architecture elements are respectively reflected in the vertical combination of the composite sand bodies, the plane combination of the single sand bodies, the particle size changes in the vertical of hyperplasia in the single sand body, the coset and lamina. In the case of the sand body development of the petroliferous basin, varying water level conditions and research locations resulted in significant variation in the distribution and combination of the sand bodies in the lacustrine basin.     

轮南地区石炭系砂泥岩段S3层储层特征与评价

从沉积环境入手,依据岩芯、铸体薄片、测井解释、压汞试验、物性分析等资料,并结合区域地质背景对塔里木盆地北部轮南地区石炭统卡拉沙依组砂泥岩段S3砂组进行了研究。结果表明:该区砂泥岩段S3砂组优质储层的岩性为岩屑砂岩、含砾不等粒砂岩、粉砂岩等;储层孔隙类型以粒间孔、粒间溶孔为主,发育少量粒缘缝;碳酸盐岩胶结物在轮南地区砂泥岩段S3砂组储层中较为普遍;钙质体积分数较高。钙质主要以方解石、铁方解石、铁白云石胶结物的形式存在;优质储层的分布受控于沉积环境,集中发育在砂泥岩段S3砂组上部的三角洲前缘相的分流河道与前缘席状砂和砂泥岩段S3砂组下部潮坪相的潮道和砂坪微相里,所以这些区域是油气勘探的重点目标区。     

基于叠前地质统计学反演的高分辨河道识别及薄层预测——以东海B气田为例

东海盆地B气田主力储层为浅水三角洲分流河道沉积砂体,储层埋藏深、横向变化快,薄储层、薄夹层发育,常规反演技术无法清晰识别河道和准确分辨薄层,开发井实施面临风险,为此采用叠前地质统计学反演技术来开展储层精细刻画研究。通过对岩相概率和变差函数的精细化分析求取了可靠的地质统计参数,降低了反演的不确定性。反演结果准确预测出了砂体内部7~8 m厚的薄夹层分布,刻画出了4期河道砂体的沉积变迁过程,据此指导了主力层多口水平分支井的实施并获得70.4%~92.3%的高砂岩钻遇率,从而证实了该技术对中深层薄层预测的有效性和准确性。