陕北地区长8<sub>1</sub>浅水缓坡砂体类型特征及成因模式

刘显阳，李树同，王琪，邱军利，郭正权，楚美娟

doi:10.11764/j.issn.1672-1926.2013.01.47

天然气地球科学 >

2013 , Vol. 24 >Issue 1: 47 - 53

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.01.47

天然气地质学

陕北地区长8₁浅水缓坡砂体类型特征及成因模式

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刘显阳(1969-)，男，甘肃庆阳人，高级工程师，在读博士，主要从事沉积学及油气地质研究. E-mail：lxy3_cq@petrochina.com.cn.

收稿日期: 2012-10-16

修回日期: 2012-12-17

网络出版日期: 2013-02-10

基金资助

国家科技重大专项(编号：2011ZX05044；2011ZX05001)；中国科学院西部之光项目；中国科学院油气资源研究重点实验室开放基金项目(编号：KFJJ2010-01)联合资助.

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Characteristics and Genetic Model of Sand Body Type in Shallow Gentle Slope from Chang 8₁ in Shanbei Area

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1.College of Energy Resources,Chengdu University of Technology,Chengdu 610059,China;
2.Exploration Department,PetroChina Changqing Oilfield Company,Xi′an 710018,China;
3.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academyof Sciences,Lanzhou 730000,China;4.Research Institute of Exploration and Development,PetroChina ChangqingOilfield Company,Xi′an 710018,China;5.National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields，Xi′an 710018, China.

Received date: 2012-10-16

Revised date: 2012-12-17

Online published: 2013-02-10

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摘要

鄂尔多斯盆地在长8₁期处于浅水湖泊沉积环境，盆地东北部的陕北地区在该期湖盆底部形态相对更加平缓、水体更浅。利用测井、岩心、薄片等资料，从储层类型、时空展布、岩石学特征、物性等方面研究了长8₁储层特征，认为研究区长8₁期主要发育水下分流河道砂体和河口坝砂体，砂体单层厚度薄、泥质含量高，具有明显的多旋回性、砂体垂向和纵向上连续性差，但分布范围广；砂体为岩屑长石砂岩和长石岩屑砂岩，属于细砂岩和极细砂岩；物性整体上差，属于典型的低孔特低渗—超低渗储层。分析表明造成该类型砂体形成的主要原因是：①研究区距离物源区远，且供给量不充足；②水体浅、湖盆底部形态平缓，湖岸线波及范围广；③湖水动力和河水动力弱。因此，在上述沉积环境下，在小期次湖平面升降过程中，长8₁砂体形成了“拉锯”式的砂体沉积模式。[HJ]

关键词： 浅水缓坡; 砂体类型; 低孔低渗; 成因模式; 延长组; 鄂尔多斯盆地

本文引用格式

刘显阳，李树同，王琪，邱军利，郭正权，楚美娟 . 陕北地区长8₁浅水缓坡砂体类型特征及成因模式[J]. 天然气地球科学, 2013 , 24(1) : 47 -53 . DOI: 10.11764/j.issn.1672-1926.2013.01.47

Abstract

Interval Chang 8₁was regarded as shallow lake sedimentary environment in Ordos basin,and the basin had a more gentle bottom morphology and more shallow water body in Shanbei area.The Chang8₁reservoir is investigated by means of well-logging,core properties,thin sections for reservoir types,temporal-spacial distribution,lithology and reservoir physical property.It′s showed that the area main developed underwater distributary channel sandstone and mouth bar sandstone with thin monolayer,high shale content,significant multiply cyclicity,poor continuity in vertical and longitudinal direction and wide distribution.The sandstones is lithic feldspar and feldspar lithic sandstone,which are regarded as packsand and hone.The reservoir is regarded as low porosity and low-extra-low permeability reservoir as to the poor physical property.Analysis shows that there are 3 reasons why this kind of sand body formed.First,the study area was far away from the provenance,which led to the insufficient supplication.Second,water was shallow,the bottom morphology is gentle and the lake shoreline spread widely.In addition,the water power of lake and river was weak.Therefore,in small times of lake level lifting process,see-saw type sedimentation model was formed in the Chang 8₁ sandstone.

Key words：

Shallow gentle slope; Sand body type; Low porosity and low permeability; Genetic model; Yanchang Formation; Ordos basin

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