三角洲前缘

• The lithological traps related to jishan delta ? turbidite fan depositional system inherently developed during the base level falling period of c3 cycle and the base level rising period ; the lithological traps related to the underwater fan depositional system near xiakou fault developed during c2 cycle ; the lithological traps related to qudi fan delta developed during the base level falling period of c2 cycle ; and there are a few lithological traps related to shangfeng delta . these predicted traps are mainly distributed in the deeply low - lying areas
  在沉积体系、沉积相研究的基础上，对临南洼陷沙三段岩性圈闭分布作出了预测，指出了各旋回基准面下降期是寻找岩性圈闭的有利层序地层位置， (扇)三角洲前缘滑塌作用或快速充填作用形成的浊积扇或滑塌作用形成的浊积岩体是岩性圈闭形成的主要场所。
• The most favourable sequences for subtle traps are cycle 3 and cycle 4 , and the most favourable oil and gas - pool forming regions are jishan sandstone , fan - delta sandstone of south part of linnan sag , sliding turbidity sandstone of the slope part of shuangfen delta front and turbidity and sub - fan near fault of jiangjia dian
  基山砂体、临南洼陷南部沙三下扇三角洲砂体、双丰三角洲前缘的斜坡地带的滑塌浊积岩砂体和江家店地区的浊积扇体和近岸水下扇体是最有利的勘探目标区。
• By summarizing and analyzing the geological setting , uranium source , paleoclimate , hydrology , lithologic - lithofacies conditions in the region , it is indicated that the quantou formation in fanjiatun - jiutai area and the qingshankou formation in yangdachenzi area are potential metallogenic prospective areas for in - situ leachable sandstone type uranium deposit in the region , which develop braided channel or delta marginal sandstones , and possess favorable forming conditions of interlayer oxidation zone , and constituting supply - passage - discharge system of abundant uranium source
  综合研究区域成矿地质背景、铀源、古气候、水文地质、岩性岩相条件，认为范家屯九台一带的泉头组及杨大城子一带的青山口组发育辫状河或三角洲前缘砂体，构成了铀源供应充足的补径排系统，具有有利的层间氧化带形成条件，是本区地浸砂岩型铀矿的有利成矿远景区带。
• Through predicting and estimating the third member of shahejie formation , this paper pointed that the fan delta front of the top third member shahejie formation in oubei area is a good - quality reservior sand - body , which was proved by the practical production . the upper fan - delta and the lower turbidite - fan sand - body are also good - quality reserviors
  对沙三上、中、下的储层进行了综合预测和评价，指出在欧北地区沙三上的扇三角洲前缘为一套有利的储集砂体，这一点已为实际生产所证实。
• The variations in trace element contents and ratios may hold up a mirror to the lake - level fluctuations and climatic changes , which , in turn , have exerted a direct and important effect on the sequence stratigraphic development . collectively , the reservoir rocks from the yanchang formation consist dominantly of the delta front subfacies subaqueous distributary channel and channel - mouth bar microfacies and delta plain subfacies subaerial distributary channel microfacies fine - grained feldspar sandstones and siltstones . the reservoir rocks have been subjected to three stages of diagenetic and porosity evolution : ( 1 ) the porosity reduction by the mechanical compaction and chemical pressure solution during the early diagenetic stage ; ( 2 ) the porosity increase by the dissolution during the a substage of the late diagenetic stage , and ( 3 ) the porosity reduction by the cementation and filling during the b substage of the late diagenetic stage
  系统的储层特征研究表明，该区延长组储层成因类型主要为三角洲前缘水下分流河道、河口砂坝及三角洲平原水上分流河道微相细粒长石砂岩、粉砂岩；储层岩石经历了压实，胶结，溶蚀等成岩作用，历经早成岩机械压实和化学压溶孔隙缩小期、晚成岩a亚期溶蚀作用孔隙扩大期及晚成岩a亚期( b亚期)胶结充填孔隙缩小期三个成岩-孔隙演化阶段；储层物性总体上具有较低孔渗、低孔渗的特点，孔隙类型主要为粒间溶孔、残余粒间孔隙、粒内溶孔、晶间孔及晶间溶孔，裂缝不发育，储集岩排驱压力和中值压力较高，孔隙结构类型以细小孔-微孔隙，微细喉-微喉型为主。
• During the early stage of middle permian , the studied area is dominant , from north to south , of alluvial fans , braided stream , braided delta plain , braided delta front and littoral deposits , while the extension of sedimentary facies belts in the middle and the late stage of middle permian is as the same as that of shanxi stage
  中二叠世早期，研究区由北向南依次为冲积扇、辫状河、辫状河三角洲平原、辫状河三角洲前缘和滨浅湖所占据。中二叠世中晚期，沉积相带展布顺序与山西期相同。
• According to the abundance well logging , mud logging and core analysis data , gaotaizi reservoir has been classified into four sand group with the principle of cycle comparison and classified control . based on the detailed study of lithologic character , sedimentary structure , paleontologic fossils , depositional sequence , rock association and logging data , the microfacies of the studied area are divided into such seven types : subaqueous distributary channel microfacies ; river mouth bar microfacies ; subaqueous interdistributary channel microfacies ; subaqueous crevasse channel microfacies ; subaqueous natural barrier microfacies ; distal bar microfacies ; delta front sheet sand microfacies . the characteristic of each sedimentary microfacies are described detailedly
  通过研究大量测井、录井资料和岩芯资料，依据“旋回对比，分级控制”的原则，把研究区高台子油层划分为g 、 g 、 g 、 g四个砂层组。通过对研究区岩性、沉积构造、古生物、沉积序列、岩石组合及测井曲线特征进行研究的基础上，认为研究区高台子油层属于三角洲前缘亚相沉积，并将研究区沉积微相划分为：水下分流河道、河口坝、水下分流河道间、水下决口扇、水下天然堤、远砂坝、席状砂等七种微相类型。
• Using sedimentary facies analytical and formation inverse technique , the depositional characteristics and distribution of dujiatai formation of this area were described , disclosing that delta front facies and prodelta facies were mainly developed in dujiatai formation . material source are mainly from southern and northeast of the working area . sand types are mainly of delta front subwater distributaries channel sand body , river mouth bar and sheet sand body with large degree of planar variation
  2 .采用沉积相分析及储层反演预测技术，对新齐14井区杜家台油层储层沉积特征及展布特征进行了详细描述，揭示出本区主要目的层杜家台油层属t -扇二角洲沉积，发育扇三角洲前缘亚相及前扇三角洲亚相，物源主要来自于工区南部及东北部，发育的砂体类型土要为扇三角洲前缘水下分流河道砂体、河口坝砂体及席状砂砂体。
• From sedimentology symbol such as rock assembled , sediment gradus , sandstone grading analysis , protogene sedimentary structure , ichnofossile and logging facies etc and palaeoenvironment background , it is confirmed that shen84 - an12block s34 segment is braid river delta system , not fan delta system ( abrupt slope ) . then it can be more partition as braid river delta plain sedimentary assembled , delta front sedimentary assembled and prodelta sedimentary assembled on core and log assembled . and delta plain sedimentary assembled can be identified four microfacies : braided distributary channel , crevasse splay , overbank deposits and interdistributary bay
  沉积微相研究是储层非均质性研究的基础，研究区有丰富的岩芯资料和测井资料，通过岩石组合、沉积韵律，砂岩粒度分析、沉积构造、古生物遗迹和测井相等沉积学标志，结合古环境背景，确定沈84 ?安12块s _ 3 ~ 4段为辫状河三角洲体系，而不是前人所认为的扇三角洲(陡坡型)体系，在岩芯和测井组合上可进一步划分为辫状河三角洲平原沉积组合、三角洲前缘沉积组合和前三角洲沉积组合，其中三角洲平原沉积组合又可识别出辫状分流河道、决口扇、分流河道边部和分流间湾四种微相类型；三角洲前缘沉积组合识别出水下分流河道、水下分流河道边部和分流河口坝三种微相。
• Sedimentary facies consist of fan delta , delta , nearshore submarine fan , sublacustrine fan , littoral - shallow lake beach and bar , as well as littoral - shallow lake , and semideep - deep lake facies and subfacies , of which the preferred sedimentary facies include delta , fan delta front , sublacustrine fan , midfan and outer fan of the nearshore submarine fan , and beach - bar facies developed in the littoral - shallow lake
  综合考虑物源特徵、沉积环境、沉积体系平面展布以及生、储、盖组合关系，认为有利的沉积相带主要是三角洲、扇三角洲前缘、湖底扇、近岸水下扇的中扇和外扇以及滨浅湖中发育的滩坝和砂坝。