沉积微相对超深储层岩石力学性质的影响及其应用——以塔里木盆地库车坳陷BZ气田白垩系为例

王志民; 孙海涛; 张辉; 王晨光; 尹国庆; 徐珂; 钟大康

沉积微相对超深储层岩石力学性质的影响及其应用——以塔里木盆地库车坳陷BZ气田白垩系为例

王志民¹,
孙海涛^2,3, ,,
张辉¹,
王晨光^2,3,
尹国庆¹,
徐珂¹,
钟大康^2,3

1. 中国石油塔里木油田分公司勘探开发研究院, 新疆库尔勒 841000;
2. 中国石油大学(北京) 地球科学学院, 北京 102249;
3. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249

基金项目:

中国石油天然气股份有限公司科技专项(2023ZZ14YJ03)资助。

详细信息

作者简介:
王志民(1988-),男,硕士,工程师,从事地质资源与地质工程研究。E-mail:wangzhm-tlm@petrochina.com.cn。

通讯作者:
孙海涛(1985-),男,博士,副教授,从事沉积岩石学方面的研究。E-mail:haitao.sun@cup.edu.cn。

中图分类号: TE122.23
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出版历程
- 收稿日期: 2023-12-01
- 网络出版日期: 2023-12-21

Influence of sedimentary microfacies on mechanical properties of ultradeep reservoir rocks and its application:a case study of Cretaceous in BZ gas field of Kuqa Depression, Tarim Basin

1. Tarim Oilfield Branch Company, CNPC, Kurla, Xinjiang 841000, China;
2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China

摘要

摘要:
为了优选塔里木盆地库车坳陷白垩系超深致密砂岩储层单井天然裂缝发育的甜点层段,利用露头、岩石薄片、成像测井等资料系统分析了BZ气田不同沉积微相的储层岩石力学性质差异,并结合相关露头中不同沉积微相的几何参数模型,提出了一种优化储层岩石力学参数模型的方法,提高了井筒周围(<200 m)天然裂缝预测精度。研究结果表明:(1) BZ气田白垩系巴什基奇克组三段不同沉积微相、相同微相不同位置的储层中,岩石组构和岩石组合(包括碎屑含量、杂基含量、粒度分选、砂地比和砂泥岩组合等)具有差异,从而影响了储层的泊松比和杨氏模量,不同微相储层具有不同的岩石力学参数。(2)不同沉积微相砂体的裂缝发育程度有所差异,扇三角洲前缘水下分支河道砂岩的裂缝最发育,比扇三角洲前缘支流间湾微相及扇三角洲平原分支河道微相更容易形成裂缝。(3)进一步根据露头中沉积微相几何参数,建立不同微相的三维模型,即可建立和优化井筒周围的沉积微相模型及岩石力学参数模型,并应用到井筒周围的裂缝预测中。
- 裂缝预测 /
- 储层地质力学 /
- 沉积微相 /
- 致密砂岩 /
- 超深储层 /
- 塔里木盆地
Abstract:
In order to optimize the sweet spot intervals with natural fractures in the well of Cretaceous ultra-deep tight sandstone reservoirs in the Kuqa Depression of Tarim Basin, the difference of reservoir rock mechanical properties of different sedimentary microfacies in BZ gas field was systematically analyzed by using outcrop, rock slice, imaging logging and other data. Then the geometric parameter models of different sedimentary microfacies in related outcrops were combined to propose a new method to optimize the reservoir rock mechanical parameter model, which improved the prediction accuracy of natural fractures around the wellbore (< 200 m). This research indicates that:(1) There are differences in reservoir rock fabrics and rock combinations (including debris content, matrix content, grain sorting, sand ratio, and sandstone-mudstone combination) among various sedimentary microfacies and different parts of the same microfacies, which affects the Poisson's ratio and Young's modulus of the third member of Bashijiqike Formation in BZ gas field. (2) The degree of crack development varies among different sedimentary microfacies of sand bodies, with the sandstone in the underwater branch channel of fan delta front being the most developed, making it easier to form cracks than the inter bay microfacies of fan delta front and the branch channel microfacies of fan delta plain. (3) So we conclude that different microfacies reservoirs have different rock mechanical parameters. Furthermore, a three-dimensional microfacies model was established based on the geometric parameters of sedimentary microfacies in outcrops and was used to optimize sedimentary microfacies models and rock mechanics parameter models around wellbores, which were applied to fracture prediction around wellbores.
- fracture prediction /
- reservoir geomechanics /
- sedimentary microfacies /
- tight sandstone /
- ultra-deep reservoir /
- Tarim Basin

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