涠西南凹陷流三段储层成岩相分析与甜点储层预测

娄敏; 杨香华; 姚光庆; 姜平; 邱凌越

doi:10.16562/j.cnki.0256-1492.2019072202

涠西南凹陷流三段储层成岩相分析与甜点储层预测

娄敏^1,,
杨香华²,
姚光庆²,
姜平³,
邱凌越⁴

1.
中海石油（中国）有限公司上海分公司，上海 200335

2.
中国地质大学资源学院，武汉 430074

3.
中海石油（中国）有限公司湛江分公司，湛江 524057

4.
中国石油大学，北京 102249

基金项目: 国家科技重大专项“北部湾盆地、珠江口盆地古近系低渗储层成岩作用和储层特征研究”（2016ZX05024-006）

详细信息

作者简介: 娄敏（1993—），男，硕士，主要从事盆地沉积学、层序地层学及储层预测方向的研究工作，E-mail： loumin2@cnooc.com.cn

中图分类号: P744

收稿日期: 2019-07-22

修回日期: 2019-11-24

刊出日期: 2020-06-25

Diagenetic facies analysis and sweet point reservoir prediction for the 3rd Member of Liushagang Formation in the Weixinan Sag

LOU Min^1,,
YANG Xianghua²,
YAO Guangqing²,
JIANG Ping³,
QIU Lingyue⁴

1.
Shanghai Branch of CNOOC Ltd, Shanghai 200335, China

2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

3.
Zhangjiang Branch of CNOOC Ltd, Zhanjiang 524057, China

4.
China University of petroleum, Beijing 102249, China

Received Date: 22 July 2019

Revised Date: 24 November 2019

Publish Date: 25 June 2020

摘要

摘要:
根据岩心、铸体薄片、扫描电镜、阴极发光、X衍射等资料并结合物性资料，对北部湾盆地涠西南凹陷流三段储层的储层特征、成岩作用特点进行了研究。结果表明研究区压实作用强烈是储层致密化的主要原因。胶结作用对储层有一定的破坏作用，但是早期碳酸盐胶结、自生高岭石有利于优质储层的发育。溶蚀作用是优质储层发育的基础，破裂作用改善了储层的渗流能力。在成岩作用研究的基础上，根据成岩作用的强度及特殊成岩矿物，划分了五类成岩相。其中，弱压实弱胶结相物性最好，中等压实中等溶蚀相、强压实中强溶蚀相物性次之，压实充填相和碳酸盐致密胶结相物性最差。通过成岩相的测井响应分析，识别了单井-剖面-平面的成岩相。预测研究区东部辫状河三角洲浅埋藏储层、西北部扇三角洲和西南部扇三角洲的水下分流河道中厚层砂砾岩体储层为甜点发育区。
- 成岩作用 /
- 成岩相 /
- 低渗储层 /
- 流沙港组三段 /
- 涠西南凹陷
Abstract:
Data from cores, casting thin sections, scanning electron microscopy, cathodoluminescence and X-ray diffraction are applied to study the petrological characteristics and diagenesis of the reservoirs of the 3^rd Member of the Liushagang Formation in the Weixinan Sag of Beibu Gulf Basin. Special attention is paid to diagenesis and its evolutionary stages. It is found that strong compaction is the main reason for density and tightness increase of the sediments. Cementation seems to have certain negative impact to reservoir properties, but the early carbonate cementation and authigenic kaolinite always have close connections with high-quality reservoirs. Dissolution is a basic process for enhancement of reservoir qualities, and fractures may improve the permeability of reservoir rocks. According to the intensity of diagenesis and the composition of diagenetic minerals, five types of diagenetic facies are qualitatively recognized. Among them, the diagenetic facies of weak compaction and weak cementation are the best for hydrocarbon accumulation, followed by the medium compaction and medium dissolution facies, and the strong compaction and medium to strong dissolution facies. The compaction and filling facies and the densely carbonate cemented facies are listed the worst in quality. Five types of logging curves are selected to define and describe the diagenetic facies. With the spatial distribution of diagenetic facies, it is recognized that the shallow buried deltaic reservoirs in the east of the study area, and the thick conglomerate reservoir of underwater distributary channel facies in northwest and southwest fan deltas are the sweet points of reservoirs in the study area.
- diagenesis /
- diagenetic facies /
- low permeability reservoir /
- 3rd Member of Liushagang Formation /
- Weixinan Sag

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图 1 涠西南凹陷流三段砂岩类型三角图

Figure 1.

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图 2 研究区流三段储层孔隙类型

Figure 2.

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图 3 涠西南凹陷流三段储层压汞曲线类型

Figure 3.

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图 4 涠西南凹陷流三段储层物性分布直方图

Figure 4.

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图 5 涠西南凹陷流三段储层成岩作用类型

Figure 5.

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图 6 胶结物含量和粒间体积交会图

Figure 6.

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图 7 碳酸盐胶结物含量对物性的影响

Figure 7.

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图 8 黏土矿物含量与储层孔隙度的关系

Figure 8.

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图 9 涠西南凹陷流三段储层压实率、胶结率和视溶蚀率分布图

Figure 9.

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图 10 各类成岩相测井参数交会图

Figure 10.

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图 11 WZB-3W-1井成岩相预测效果对比图

Figure 11.

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图 12 单井成岩相图

Figure 12.

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图 13 涠洲B-3井区成岩相连井剖图

Figure 13.

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图 14 涠西南凹陷流三段上下层序成岩相平面图

Figure 14.

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表 1 成岩相划分依据

Table 1. The classification of diagenetic facies of the reservoirs

成岩相	视压实率/%	视胶结率/%	视溶蚀率/%
弱压实、弱胶结相	＜30	＜30	＜30
中等压实中等溶蚀相	30～70	＜30	30～60
强压实中-强溶蚀相	＞70	30～70	＞60
压实-充填相	＞70	30～70	＜30
致密碳酸盐胶结相	＞30	＞90	＜30

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表 2 各类成岩相的测井值范围

Table 2. The Logging ranges for different diagenetic facies

成岩相类型	范围及均值	GR/API	AC/（μs/ft）	CNCF/%	DEN/（g/cm³）	RILD/Ω·m
弱压实弱胶结相	范围	60～120	90～110	0.25～0.3	2.2～2.4	12～15
弱压实弱胶结相	均值	98	92	0.26	2.3	13
中等压实中等溶蚀相	范围	40～80	80～95	0.18～0.3	2.1～2.4	0～15
中等压实中等溶蚀相	均值	77	86	0.23	2.3	7
强压实中-强溶蚀相	范围	50～120	70～90	0.08～0.15	2.3～2.6	10～15
强压实中-强溶蚀相	均值	94	75	0.14	2.4	12
压实-充填相	范围	130～180	80～90	0.1～0.3	2.4～2.6	8～12
压实-充填相	均值	163	88	0.23	2.5	9
碳酸盐致密胶结相	范围	110～180	70～85	0.25～0.35	2.4～2.6	12～20
碳酸盐致密胶结相	均值	147	77	0.29	2.5	16

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涠西南凹陷流三段储层成岩相分析与甜点储层预测

1. 中海石油（中国）有限公司上海分公司，上海 200335 2. 中国地质大学资源学院，武汉 430074 3. 中海石油（中国）有限公司湛江分公司，湛江 524057 4. 中国石油大学，北京 102249

作者简介: 娄敏（1993—），男，硕士，主要从事盆地沉积学、层序地层学及储层预测方向的研究工作，E-mail： loumin2@cnooc.com.cn

Diagenetic facies analysis and sweet point reservoir prediction for the 3rd Member of Liushagang Formation in the Weixinan Sag

1. Shanghai Branch of CNOOC Ltd, Shanghai 200335, China 2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China 3. Zhangjiang Branch of CNOOC Ltd, Zhanjiang 524057, China 4. China University of petroleum, Beijing 102249, China

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1.
中海石油（中国）有限公司上海分公司，上海 200335

2.
中国地质大学资源学院，武汉 430074

3.
中海石油（中国）有限公司湛江分公司，湛江 524057

4.
中国石油大学，北京 102249

1.
Shanghai Branch of CNOOC Ltd, Shanghai 200335, China

2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

3.
Zhangjiang Branch of CNOOC Ltd, Zhanjiang 524057, China

4.
China University of petroleum, Beijing 102249, China