鄂尔多斯盆地西部奥陶系克里摩里组有效储层发育控制因素

李慧敏; 赵振宇; 宋微; 张涛; 赵当妮; 蒋婷婷; 张丽; 陈朝兵

doi:10.11781/sysydz202303434

鄂尔多斯盆地西部奥陶系克里摩里组有效储层发育控制因素

doi: 10.11781/sysydz202303434

李慧敏^{1, 2,},
赵振宇³,
宋微³,
张涛⁴,
赵当妮⁴,
蒋婷婷⁴,
张丽⁴,
陈朝兵^{1, 2, ,}

1.
西安石油大学地球科学与工程学院, 西安 710065
2.
陕西省油气成藏地质学重点实验室, 西安 710065
3.
中国石油勘探开发研究院, 北京 100083
4.
中国石油长庆油田分公司第二采气厂, 西安 710200

基金项目:

国家自然科学基金 41802140

国家科技重大专项 2016ZX05050006

陕西省自然科学研究基础计划项目 2019JQ-257

刘宝珺地学科学基金 DMSM2019007

西安石油大学研究生创新与实践能力培养计划 YCS22213066

详细信息

作者简介:
李慧敏(1998—)，女，硕士生，从事沉积与储层地质研究。E-mail: 2952892868@qq.com

通讯作者:
陈朝兵(1984-), 男, 博士, 副教授, 从事沉积学与石油地质研究。E-mail: zbchen@xsyu.edu.cn

中图分类号: TE122.2
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- 文章访问数: 356
- HTML全文浏览量: 175
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-22
- 修回日期: 2023-04-26
- 刊出日期: 2023-05-28

Controlling factors for effective reservoir development of Ordovician Kelimoli Formation in western Ordos Basin

LI Huimin^{1, 2
,},
ZHAO Zhenyu³,
SONG Wei³,
ZHANG Tao⁴,
ZHAO Dangni⁴,
JIANG Tingting⁴,
ZHANG Li⁴,
CHEN Zhaobing^{1, 2
, ,}

1.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
2.
Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4.
No.2 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710200, China

摘要

摘要: 近年来，鄂尔多斯盆地西部奥陶系的天然气勘探取得了一定进展，其中以奥陶系克里摩里组天然气聚集程度最高，但其有效储层发育控制因素复杂，导致勘探效果不理想。基于岩心观察、薄片鉴定、钻录井等资料，系统研究了克里摩里组有效储层发育类型及控制因素，建立了有效储层发育模式。鄂尔多斯盆地西部克里摩里组有效储层类型主要有白云岩晶间(溶)孔、灰岩岩溶缝洞和构造微裂缝，局部发育台缘滩颗粒孔型储层；有效储层发育主要受控于沉积相带、成岩作用、古岩溶风化作用及构造运动，其中潮坪相及台缘滩相为克里摩里组提供了原始储层的物质基础，并在此基础上形成了成岩早期的白云岩晶间(溶)孔和台缘滩颗粒孔型储层；埋藏成岩作用阶段，重结晶作用对原始白云岩储层改造明显，晶体骨架更加稳固，新的晶间(溶)孔形成或经历二次重结晶改造，同时台缘滩颗粒孔的原始结构部分被破坏、充填或改善，形成现今的台缘滩残余颗粒孔；古岩溶风化作用控制克里摩里组中上部岩溶缝洞型储层的发育，高产井主要发育在岩溶斜坡沟槽地带的上槽方向及岩溶高地；多期构造运动不断改造、控制微裂缝系统的发育，形成断裂带周边分布的多孔介质储集体。因此，寻找克里摩里组潮坪相和台缘滩相有利相带、岩溶古地貌上倾部位或断裂带高部位，是下一步勘探的有利方向。
- 有效储层类型 /
- 古岩溶 /
- 风化作用 /
- 成岩作用 /
- 克里摩里组 /
- 奥陶系 /
- 鄂尔多斯盆地西部
Abstract: In recent years, some progress has been made in the exploration of Ordovician natural gas in the western Ordos Basin, among which, the Ordovician Kelimoli Formation has the highest degree of natural gas accumulation. However, the controlling factors for effective reservoir development are complicated, leading to unsatisfactory exploration effect. Based on the data of core observation, thin section identification, drilling and logging, the development types and controlling factors of effective reservoir in the Kelimoli Formation were systematically studied, and a development model of effective reservoir was established. The results show that the effective reservoir types of Kelimoli Formation in the western Ordos Basin mainly include dolomite intercrystal (dissolved) pore, limestone karst fracture and structural micro-fracture, and marginal platform granular pore type reservoir is locally developed. The development of effective reservoir was mainly controlled by sedimentary facies, diagenesis, paleokarst weathering and tectonic movement. The tidal flat facies and marginal platform facies provided the material basis for the original reservoir of the Kelimoli Formation, and on this basis, the dolomite intercrystal (dissolved) pore and marginal platform granular pore reservoirs were formed in the early diagenesis. In the stage of burial diagenesis, recrystallization obviously reformed the original dolomite reservoir, and the crystal framework became more stable. New intercrystal (dissolved) pores were formed or underwent secondary recrystallization. At the same time, the original structure of marginal platform granular pores was damaged, filled or improved, and the present marginal platform residual granular pores were formed. Paleo-karst weathering controlled the development of fracture-vuggy reservoirs in the middle and upper parts of the Kelimoli Formation, and high-yield wells were mainly drilled in the upper groove direction of the karst slope groove zone and karst highlands. The multi-stage tectonic movement continuously transformed and controlled the development of micro-fracture system, forming porous media reservoirs distributed around the fault zone. Therefore, it is a favorable direction for further exploration to find favorable facies belts of tidal flat facies and marginal platform facies, updip positions of karst paleo-geomorphology or high positions of fault zone.
- effective reservoir type /
- paleokarst /
- weathering /
- diagenesis /
- Kelimoli Formation /
- Ordovician /
- western Ordos Basin

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图 1 鄂尔多斯盆地西部奥陶系区域地质概况

Figure 1. Regional geologic survey of Ordovician system in western Ordos Basin

下载: 全尺寸图片幻灯片

图 2 鄂尔多斯盆地西部奥陶系克里摩里组典型岩石及其孔隙特征显微图片

a.忠探1井，4 264.1 m，角砾状灰岩, 含黄铁矿, 为深水滑塌成因；b.忠探1井，4 265.0 m, 角砾状灰岩；c.忠探1井，4 366.8 m，滑塌角砾岩，砾石具有一定磨圆；d.余3井，4 144.8 m，岩溶作用形成的孔洞；e.余探1井，4 051.1 m，灰岩，发育灰岩缝洞；f.余3井，4 137.5 m，杂基支撑的滑塌构造，发育微裂缝；g.惠探1井，4 660.0 m，发育白云岩晶间(溶)孔；h.梁探1井，5 062.9 m，细晶白云岩，发育晶间孔；i.鄂65井，3 980.8 m，粉—细晶云岩，晶间溶孔；j.天1井，3 936.0 m，藻屑灰岩溶孔；k.余3井，4 140.4 m，灰岩岩溶缝洞发育；l.李1井，3 909.0 m，颗粒灰岩^[7]；m.余探2井，3 978.2 m，电子探针下的裂缝及局部方解石充填；n.惠探1井，4 660.0 m，发育微裂缝；o.忠探1井，4 520.2 m，发育构造微裂缝

Figure 2. Microscopic images of typical rocks and pore characteristics of Ordovician Kelimoli Formation in western Ordos Basin

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图 3 鄂尔多斯盆地西部奥陶系克里摩里组有效储层发育模式

Figure 3. Development model of effective reservoir of Ordovician Kelimoli Formation in western Ordos Basin

下载: 全尺寸图片幻灯片

图 4 鄂尔多斯盆地西部奥陶系克里摩里组白云岩储层厚度分布

Figure 4. Thickness of dolomite reservoir in Ordovician Kelimoli Formation, western Ordos Basin

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图 5 鄂尔多斯盆地西部奥陶系克里摩里组沉积模式

Figure 5. Sedimentary model of Ordovician Kelimoli Formation in western Ordos Basin

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图 6 鄂尔多斯盆地西部奥陶系地震剖面解释

Figure 6. Interpretation of Ordovician seismic profile in western Ordos Basin

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图 7 鄂尔多斯盆地西部奥陶系克里摩里组顶部岩溶古地貌与试气成果叠合图

Figure 7. Composite of karst paleo-geomorphology and gas test results at the top of Ordovician Kelimoli Formation, western Ordos Basin

下载: 全尺寸图片幻灯片

图 8 鄂尔多斯盆地西部各层系东西向H125907线综合解释剖面

Figure 8. Comprehensive interpretation section of E-W H125907 line in western Ordos Basin

下载: 全尺寸图片幻灯片

表 1 鄂尔多斯盆地西部奥陶系克里摩里组有效储层物性特征

Table 1. Physical characteristics of effective reservoir of Ordovician Kelimoli Formation in western Ordos Basin

有效储层类型	孔隙度/%		渗透率/10^-3 μm²		物性解释
有效储层类型	范围	平均	范围	平均	物性解释
白云岩晶间(溶)孔	3.1~10.7	7.2	1.2~4.7	3.1	孔隙度高，渗透性中等
台缘滩颗粒孔	3.2~15.8	10.2	2.3~10.2	4.3	孔渗性最好，但储层规模极小
灰岩岩溶缝洞	4.2~14.8	9.8	1.7~7.9	3.7	孔渗性良好，但储层非均质性差
构造微裂缝	0.2~3.5	1.6	3.1~10.8	5.2	孔隙度较小，局部渗透性较好

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表 2 鄂尔多斯盆地西部奥陶系克里摩里组部分探井钻井液漏失情况统计

Table 2. Statistics of drilling fluid loss in some exploration wells in Ordovician Kelimoli Formation, western Ordos Basin

井号	深度/m	底深/m	厚度/m	识别标志
布1	4 125.4	4 132.5	7.1	钻时加快
棋探1	4 444.0	4 527.0	83.0	4 444 m开始钻井液漏失(累积漏失1 014 m³)，4 450 m处钻具放空20 cm
天1	3 934.0	3 940.0	6.0	发生井喷，其中3 934.7~3 935.8 m井段钻具放空1.1 m，钻井液漏失共99.5 m³
天深1	4 069.0	4 175.0	106.0	钻井液漏失323 m³

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