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北部湾盆地涠西南凹陷W区流沙港组储层非均质性研究及应用

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曾晓华, 周伟, 肖大志, 袁凌荣, 张晓禹, 李伟. 北部湾盆地涠西南凹陷W区流沙港组储层非均质性研究及应用[J]. 海洋地质前沿, 2021, 37(3): 50-59. doi: 10.16028/j.1009-2722.2020.181
引用本文: 曾晓华, 周伟, 肖大志, 袁凌荣, 张晓禹, 李伟. 北部湾盆地涠西南凹陷W区流沙港组储层非均质性研究及应用[J]. 海洋地质前沿, 2021, 37(3): 50-59. doi: 10.16028/j.1009-2722.2020.181
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ZENG Xiaohua, ZHOU Wei, XIAO Dazhi, YUAN Lingrong, ZHANG Xiaoyu, LI Wei. RESERVOIR HETEROGENEITY OF THE LIUSHAGANG FORMATION AND ITS SIGNIFICANCE IN THE W AREA OF SOUTHWEST WEIZHOU DEPRESSION OF BEIBU GULF BASIN[J]. Marine Geology Frontiers, 2021, 37(3): 50-59. doi: 10.16028/j.1009-2722.2020.181
Citation: ZENG Xiaohua, ZHOU Wei, XIAO Dazhi, YUAN Lingrong, ZHANG Xiaoyu, LI Wei. RESERVOIR HETEROGENEITY OF THE LIUSHAGANG FORMATION AND ITS SIGNIFICANCE IN THE W AREA OF SOUTHWEST WEIZHOU DEPRESSION OF BEIBU GULF BASIN[J]. Marine Geology Frontiers, 2021, 37(3): 50-59. doi: 10.16028/j.1009-2722.2020.181
shu

北部湾盆地涠西南凹陷W区流沙港组储层非均质性研究及应用

  • 中海石油（中国）有限公司湛江分公司， 广东湛江 524057

  • 基金项目: 中海油（中国）有限公司科技项目（CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ）
详细信息
    作者简介: 曾晓华（1982—），女，硕士，工程师，主要从事油气田开发地质方面的研究工作. E-mail：zengxh1@cnooc.com.cn

  • 中图分类号: P618.13；P744.4

RESERVOIR HETEROGENEITY OF THE LIUSHAGANG FORMATION AND ITS SIGNIFICANCE IN THE W AREA OF SOUTHWEST WEIZHOU DEPRESSION OF BEIBU GULF BASIN

  • Zhanjiang Branch of CNOOC (China) Ltd., Zhanjiang 524057,Guangdong, China

    摘要

  • 基于沉积微相研究和测井精细解释数据统计分析，开展了涠西南凹陷W区古近系始新统流沙港组储层非均质性研究。W区储层为流一段和流三段，沉积微相研究表明，流沙港组主要为正常三角洲相和扇三角洲相沉积。储层夹层岩性主要为泥岩、粉砂质泥岩，主要成因为分流水道间、水下分流河道与砂坝、砂坝与砂坝、辫流坝与辫状水道、辫状水道间的泥质沉积物。非均质性研究以沉积微相为基础进行，通过比较不同沉积微相的非均质性差别，分析储层的空间物性变化。非均质性研究表明，WA油田流一段夹层厚度>5 m的占51.4%，单层夹层层数>5个的占27.4%，变异系数平均值>1.2，整体上非均质性很强；WB油田流三段夹层分布均匀，东南部平面非均质性弱，西北部平面非均质强；WC和WD油田流三段整体上夹层多，但平面非均质性弱。依据非均质研究成果，对密井网的WA油田主力层进行了剩余油分布预测，并部署了2口调整井挖潜，实施后累增油4.2×104 t，采收率提高了2.3%。表明储层夹层分布和平面非均质性研究可以为油田剩余油挖潜提供依据，对油田高效开发具有重要意义。

    Detailed microfacies study and statistical analysis of fine well logging data are carried out for reservoir heterogeneity of the Liushagang Formation in the W area of the Southwest Weizhou Depression of the Beibu Gulf Basin. So far there have found four oilfields in the W area namely WA, WB, WC and WD respectively. Reservoirs mainly occur in the Member 1 and 3 of the Liushagang Formation. Sedimentary microfacies of the interlayers of the reservoir suggests that the Liushagang Formation is composed of normal delta front and fan delta front deposits including distributary channel depositss, sand bar deposits, barrier depositss and braided channel sandstones and mudstones. Sedimentology of the fan deltas is studied upon the basis of fine stratigraphic division and correlation. It shows that the interlayers in the Member 1 are dominated by mudstone, silty mudstone with argillaceous silty sandstone and some thin tight layers of sandstone. The interlayer is mainly formed in argillaceous depositional environments between the fluvial deltaic channels or between underwater distributary channels, and/or between sandy bars. Through the comparative study of reservoir heterogeneity based on microfacies, the spatial change in physical properties of reservoirs is revealed. From the statistical results of the fine-interpreted data, it is observed that the reservoirs in the Member 1 of Liushagang Formation in the WA Oilfield has more and thicker interlayers and higher heterogeneity in general; the WB Oilfield has uniformly distributed interlayers, heterogeneity is low in the southeast and high in the northwest. The Member 3 of Liushagang Formation in the oilfields WC and WD have abundant interlayers, but heterogeneity is low in general. Based on the study results of reservoir heterogeneity, prediction is made for the remaining oil of the main reservoir layers in the WA Oilfield. Then two adjustment wells were deployed to tap the remaining oil. The cumulative production is increased for 4.2×104 t, about 2.3% of enhanced oil recovery. This successful application shows that interlayer and plane heterogeneity study has provided solid scientific foundation for tapping the remaining oil out. It is of great significance for efficient oilfield development.

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  • 图 1  北部湾盆地涠西南凹陷位置与构造样式

    Figure 1. 

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    图 2  研究区流一段和流三段单井沉积微相图

    Figure 2. 

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    图 3  研究区流一段和流三段主力油层位沉积微相平面图

    Figure 3. 

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    图 4  不同沉积微相与储层非均值性对比图

    Figure 4. 

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    图 5  各油田L1变异系数平面分布图

    Figure 5. 

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    图 6  各油田L3变异系数平面分布图

    Figure 6. 

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    图 7  WA油田主力产层L1中-Ⅱ油组调整井部署图

    Figure 7. 

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    表 1  WA和WC油田L1上夹层数据统计表

    Table 1.  Statistical table of interlayer data of WA and WC oilfields on upper Member L1

    夹层厚度夹层个数夹层分布频率夹层分布密度
    范围/m个数占比/%个数层数占比/%范围个数占比/%范围个数占比/%
    02416.602416.602416.604732.4
    0～110.713322.80～0.16746.20～12718.6
    1～221.422718.60.1～0.23624.81～2128.3
    2～332.13106.90.2～0.3128.32～396.2
    3～432.14149.70.3～0.442.83～464.1
    4～521.4585.50.4～0.510.74～574.8
    >511075.9>52920>0.510.7>53725.5
    下载: 导出CSV

    表 2  WA油田L1中夹层数据统计表

    Table 2.  Statistical table of interlayer data of WA Oilfield on middle of Member L1

    夹层厚度夹层层数夹层分布频率夹层分布密度
    范围/m层数占比/%层数层数占比/%范围层数占比/%范围层数占比/%
    0042.509042.509042.5010248.1
    0～110.51157.10～0.12210.40～14621.7
    1～220.9294.30.1～0.26128.81～23114.6
    2～352.43115.20.2～0.32612.32～3157.1
    3～410.54104.70.3～0.4104.73～483.8
    4～541.951990.4～0.531.44～520.9
    >510951.4>55827.4>0.500>583.8
    下载: 导出CSV

    表 3  WC和WD油田L1下夹层数据统计表

    Table 3.  Statistical table of interlayer data of WC and WD oilfields on lower Member L1

    夹层厚度夹层层数夹层分布频率夹层分布密度
    范围/m层数占比/%层数层数占比/%范围层数占比/%范围层数占比/%
    02217.202217.202217.205845.3
    0～110.814333.60～0.132250～12015.6
    1～243.122418.80.1～0.241321～21914.8
    2～364.731814.10.2～0.31511.72～397
    3～41511.74129.40.3～0.4107.83～464.7
    4～521.6564.70.4～0.564.74～521.6
    >57860.9>532.3>0.521.6>51410.9
    下载: 导出CSV

    表 4  WB油田 L3段夹层基础数据统计表

    Table 4.  Statistical table of interlayer data of WB Oilfield on Member L3

    夹层厚度夹层层数夹层分布频率夹层分布密度
    范围/m层数占比/%层数层数占比/%范围层数占比/%范围层数占比/%
    013949.5013949.5013949.5014350.9
    0～131.11165.70～0.14415.70～14315.3
    1～293.2228100.1～0.26322.41～23311.7
    2～382.93227.80.2～0.331112～3145
    3～431.14186.40.3～0.441.43～4103.6
    4～520.75165.70.4～0.5004～582.9
    >511741.6>54215>0.500>53010.7
    下载: 导出CSV

    表 5  WC和WD油田L3段夹层基础数据统计表

    Table 5.  Statistical table of interlayer data of WC and WD oilfields on Member L3

    夹层厚度夹层层数夹层分布频率夹层分布密度
    范围/m层数占比%层数层数占比%范围层数占比%范围层数占比%
    0 19 16.1 0 19 16.1 0 19 16.1 0 21 17.8
    0～1 2 1.7 1 7 5.9 0～0.1 14 11.9 0～1 41 34.8
    1～2 3 2.5 2 22 18.6 0.1～0.2 33 28 1～2 25 21.2
    2～3 5 4.2 3 19 16.1 0.2～0.3 35 29.7 2～3 10 8.5
    3～4 1 0.9 4 16 13.6 0.3～0.4 13 11 3～4 9 7.6
    4～5 8 6.8 5 11 9.3 0.4～0.5 3 2.5 4～5 7 5.9
    >5 80 67.8 >5 24 20.4 >0.5 1 0.9 >5 5 4.2
    下载: 导出CSV
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收稿日期:  2020-11-18
刊出日期:  2021-03-28

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