Inter-layers in alluvial-fan thick sandy conglomerate reservoir of Kunbei oilfield, Qaidam Basin

doi:10.7623/syxb201902003

Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (2): 152-164.DOI: 10.7623/syxb201902003

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Inter-layers in alluvial-fan thick sandy conglomerate reservoir of Kunbei oilfield, Qaidam Basin

Gong Qingshun¹, Liu Zhanguo¹, Song Guangyong¹, Xia Zhiyuan¹, Liu Jincheng², Guan Bin², Fan Weiguang³

1. PetroChina Hangzhou Research Institute of Geology, Zhejiang Hangzhou 310023, China;
2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Gansu Dunhuang 736202, China;
3. CNPC Great Wall Drilling Engineering Company Limited, Beijing 100101, China

Received:2018-05-25 Revised:2018-10-08 Online:2019-02-25 Published:2019-03-05

柴达木盆地昆北油田冲积扇厚层砂砾岩储集层内部隔夹层

宫清顺¹, 刘占国¹, 宋光永¹, 夏志远¹, 柳金城², 管斌², 范卫光³

1. 中国石油天然气股份有限公司杭州地质研究院浙江杭州 310023;
2. 中国石油青海油田公司勘探开发研究院甘肃敦煌 736202;
3. 中国石油集团长城钻探工程有限公司北京 100101

通讯作者: 宫清顺,男,1979年9月生,2001年获中国石油大学(北京)地质工程专业学士学位,2004年获中国石油大学(北京)矿物学、岩石学、矿床学专业硕士学位,现为中国石油杭州地质研究院高级工程师,主要从事开发地质与油藏描述工作。Email:gongqs_hz@petrochina.com.cn
作者简介:宫清顺,男,1979年9月生,2001年获中国石油大学(北京)地质工程专业学士学位,2004年获中国石油大学(北京)矿物学、岩石学、矿床学专业硕士学位,现为中国石油杭州地质研究院高级工程师,主要从事开发地质与油藏描述工作。Email:gongqs_hz@petrochina.com.cn
基金资助:
国家科技重大专项(2017ZX05001-002,2016ZX05003-001-002)和中国石油天然气股份有限公司科技重大专项(2016E-01)资助

Abstract

Abstract:

In Qie12 block of Kunbei oilfield, Qaidam Basin, alluvial-fan thick sandy conglomerate reservoir is developed in the Lower Ganchaigou Formation. Comprehensively using the geology, logging and production dynamic data, this paper analyzes the pattern of alluvial fan sedimentary structure as well as the genetic mechanism, size and distribution pattern of inter-layers in different sedimentary structure units. Four sedimentary structure units are established in the alluvial fan with a lake transgression and retrogradation sedimentary sequence of grain size upward-fining vertically, including the extensively connecting body sandwiched with intermittent channels, the composite channel unit formed by the overlapping and separation of stable channels, the lateral alternated unit with braided channel and sheet flow sediment, and the runoff channel inlaid in flood plain mudstone. The results show that as viewed from physical properties, the development of inter-layer in thick sandy conglomerate is controlled by the difference of argillaceous matrix or cementation. A set of multi-parameter overlapping logging identification method is formed for sandy conglomerate interlayers, the distribution pattern of which vary significantly in different sedimentary structure units of alluvial fan, so as to analyze two types of distribution patterns of interlayer, i.e., "layer-cake architecture" distributed in the extensively connecting body, and "generally scattered and locally interlaced" pattern in the composite channel and the lateral alternated unit with braided channel and sheet flow sediment. By reconstructing the geology model of "layered and discontinuous production horizons", the "stratified fine water injection" scheme is put forward to effectively guide the reservoir comprehensive management in Qie12 block, and achieve certain practical effect.

Key words: Qaidam Basin, Kunbei oilfield, alluvial fan, sedimentary structure, inter-layer

摘要：

柴达木盆地昆北油田切12区下干柴沟组发育冲积扇型厚层砂砾岩油藏。综合利用地质、测井和开发动态资料剖析冲积扇的沉积构型,分析各构型单元中隔夹层的成因、规模和分布样式,揭示冲积扇整体表现为下粗上细的湖进退积型沉积序列,划分出4个沉积构型单元:"泛连通体"夹间歇性水道单元、稳定水道叠置分隔形成的复合水道单元、辫状水道与漫流沉积侧向相间单元、径流水道镶嵌于洪泛平原泥岩之中的单元。分析表明,厚层砂砾岩的内部受泥质杂基或胶结作用的差异控制,发育物性上的隔夹层。建立了一套多参数交叠的砂砾岩隔夹层测井识别方法。冲积扇中各构型单元的隔夹层分布样式差异大。明确了切12区存在"千层饼"状和"整体分散、局部交织"状2类隔夹层分布样式,其中,"千层饼"状样式分布于"泛连通体"单元内,"整体分散、局部交织"状样式分布于复合水道单元、辫状水道与漫流沉积侧向相间单元内。通过"层状、不连续生产层"油藏地质模型的重构,提出了"分层次、按层精细注水"的方案,有效地指导了切12区的油藏综合治理,并取得了一定应用实效。

关键词: 柴达木盆地, 昆北油田, 冲积扇, 沉积构型, 隔夹层

CLC Number:

TE112.23

Gong Qingshun, Liu Zhanguo, Song Guangyong, Xia Zhiyuan, Liu Jincheng, Guan Bin, Fan Weiguang. Inter-layers in alluvial-fan thick sandy conglomerate reservoir of Kunbei oilfield, Qaidam Basin[J]. Acta Petrolei Sinica, 2019, 40(2): 152-164.

宫清顺, 刘占国, 宋光永, 夏志远, 柳金城, 管斌, 范卫光. 柴达木盆地昆北油田冲积扇厚层砂砾岩储集层内部隔夹层[J]. 石油学报, 2019, 40(2): 152-164.

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Inter-layers in alluvial-fan thick sandy conglomerate reservoir of Kunbei oilfield, Qaidam Basin

柴达木盆地昆北油田冲积扇厚层砂砾岩储集层内部隔夹层

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