志丹地区长82砂层组缓坡浅水三角洲前缘砂体发育模式及成因

doi:10.12108/yxyqc.20200105

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (1): 36–50.doi: 10.12108/yxyqc.20200105

志丹地区长8₂砂层组缓坡浅水三角洲前缘砂体发育模式及成因

张家强^1,2,3, 李士祥⁴, 周新平⁴, 梁益财⁵, 郭睿良^1,2,3, 闫灿灿^1,2,3, 陈俊霖^1,2,3, 李树同^1,2

1. 中国科学院西北生态环境资源研究院, 兰州 730000;
2. 甘肃省油气资源研究重点实验室, 兰州 730000;
3. 中国科学院大学, 北京 100049;
4. 中国石油长庆油田分公司勘探开发研究院, 西安 710021;
5. 中国石油长庆油田分公司第九采油厂, 陕西延安 717604

收稿日期:2019-07-22 修回日期:2019-10-19 出版日期:2020-01-21 发布日期:2019-11-22
通讯作者: 李树同(1979-),男,博士,副研究员,主要从事储层沉积学方面的研究工作。Email:lishutong1979@163.com。 E-mail:lishutong1979@163.com
作者简介:张家强(1996-),男,中国科学院大学在读硕士研究生,研究方向为沉积与油气地质。地址:(730000)甘肃省兰州市城关区东岗西路382号。Email:zhangjiaqiang18@mails.ucas.ac.cn
基金资助:
国家自然科学基金面上项目“青海湖细粒沉积纹层特征与其沉积环境要素耦合关系研究”（编号：41772142）资助

Development pattern and genesis of gentle slope shallow water delta front sand bodies of Chang 8₂ sand set in Zhidan area,Ordos Basin

ZHANG Jiaqiang^1,2,3, LI Shixiang⁴, ZHOU Xinping⁴, LIANG Yicai⁵, GUO Ruiliang^1,2,3, YAN Cancan^1,2,3, CHEN Junlin^1,2,3, LI Shutong^1,2

1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou 730000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
5. No.9 Oil Production Plant, PetroChina Changqing Oilfield Company, Yan'an 717604, Shaanxi, China

Received:2019-07-22 Revised:2019-10-19 Online:2020-01-21 Published:2019-11-22

摘要/Abstract

摘要： 浅水三角洲前缘地区的油气成藏条件优越，其内部砂体历来是常规油气勘探的重点目标，弄清其沉积规律与沉积模式，是勘探取得成功的关键。利用鄂尔多斯盆地志丹地区长8₂砂层组岩心、薄片、测井和录井资料等，对该区长8₂砂体的岩石学特征、矿物学特征、测井响应特征、空间展布规律及成因类型进行研究，在考虑沉积期湖盆古地貌、古水深、古气候等的基础上，建立了缓坡浅水三角洲前缘砂体的沉积模式，并分析了其成因。研究表明：志丹地区发育2类沉积特征明显不同的浅水三角洲前缘砂体，分别是水下分支河道砂体和河口坝-滩坝复合砂体；2类砂体的岩石类型均以细粒长石砂岩和岩屑长石砂岩为主，其中水下分支河道砂体单层厚度大、砂质成熟度低，垂向上多期砂体连续叠置，平面上连片性差，而河口坝—滩坝复合砂体单层厚度小、砂质成熟度较高，频繁地夹泥—粉砂薄层，平面上连片性好；志丹地区处于湖盆的浅水缓坡上，区内砂体发育的类型与湖平面高低密切相关，水下分支河道砂体沉积主要受控于低湖平面时期的河流进积作用，而河口坝—滩坝复合砂体则主要与高湖平面期湖浪作用有关。该研究成果可为湖相缓坡浅水三角洲前缘砂体体系的研究提供借鉴。

关键词: 河口坝-滩坝复合砂体, 水下分支河道砂体, 沉积模式, 长8₂浅水三角洲, 志丹地区, 鄂尔多斯盆地

Abstract: The oil and gas accumulation conditions in the front area of the shallow water delta are superior,and the internal sand bodies are always the crucial target of conventional oil and gas exploration. The key to the successful exploration is to find out their sedimentary law and model. Based on the core,thin section and logging data of Chang 8₂ sandstone set in Zhidan area of Ordos Basin,the petrological characteristics,mineralogical characteristics,logging response characteristics,spatial distribution and genetic types of Chang 8₂ sand bodies in this area were studied. On the basis of considering the palaeogeomorphology,palaeowater depth and palaeoclimate of the lake basin during the sedimentary period,the sedimentary model of the sand bodies was established,and the genesis was analyzed. The results show that there are two types of shallow water delta front sand bodies with distinct sedimentary characteristics in Zhidan area,which are underwater distributary channel sand bodies and mouth bar-beach bar composite sand bodies. The rock types of the two types of sand bodies are mainly finegrained feldspathic sandstone and lithic feldspathic sandstone. The single-layer thickness of the underwater distributary channel sand body is larger, the sand maturity is lower, the vertical multi-stage sand bodies are continuously stacked,and the planar connectivity is poor,while the mouth bar-beach bar composite sand bodies are characterized by smaller single layer thickness,higher sand maturity,frequent mud-silt thin layer and good planar connectivity. Zhidan area is located on the shallow gentle slope of the lake basin,and the type of sand body development is closely related to the lake level. The sedimentation of underwater distributary channel sand bodies is mainly controlled by the fluvial progradation during the low lake level period,while the mouth bar-beach bar composite sand bodies are mainly related to the Lake wave transformation during the high lake level period. The research results can be used for reference in the study of the sand body system in gentle slope shallow water delta front of lake facies.

Key words: mouth bar-beach bar composite sand body, underwater distributary channel sand body, sedimentary model, Chang 8₂ shallow water delta, Zhidan area, Ordos Basin

中图分类号:

TE122.2

张家强, 李士祥, 周新平, 梁益财, 郭睿良, 闫灿灿, 陈俊霖, 李树同. 志丹地区长8₂砂层组缓坡浅水三角洲前缘砂体发育模式及成因[J]. 岩性油气藏, 2020, 32(1): 36–50.

ZHANG Jiaqiang, LI Shixiang, ZHOU Xinping, LIANG Yicai, GUO Ruiliang, YAN Cancan, CHEN Junlin, LI Shutong. Development pattern and genesis of gentle slope shallow water delta front sand bodies of Chang 8₂ sand set in Zhidan area,Ordos Basin[J]. Lithologic Reservoirs, 2020, 32(1): 36–50.

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志丹地区长8₂砂层组缓坡浅水三角洲前缘砂体发育模式及成因

Development pattern and genesis of gentle slope shallow water delta front sand bodies of Chang 8₂ sand set in Zhidan area,Ordos Basin

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