石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (1): 98-106, 123.doi: 10.11743/ogg20210109
收稿日期:
2018-11-26
出版日期:
2021-02-28
发布日期:
2021-02-07
作者简介:
沈骋(1990-), 男, 工程师, 博士, 油气田储层评价与增产理论。E-mail: 基金资助:
Cheng Shen1,2(), Lan Ren2, Jinzhou Zhao2, Mingpei Chen3
Received:
2018-11-26
Online:
2021-02-28
Published:
2021-02-07
摘要:
页岩气储层需通过水力压裂实现经济产能,但不同页岩岩相组合类型具有不同的压裂改造效果。综合考虑矿物组分、储层物性、层理缝和层理对缝网形成的影响,结合露头、岩心发育特征和压裂改造特征,以四川盆地志留系龙马溪组页岩为研究对象,建立了Ⅰ型(FA1)、Ⅱ型(FA2)、Ⅲ型(FA3)和Ⅳ型(FA4)共4类页岩相组合划分标准。研究表明,FA1受明显成岩改造,胶结充填裂缝极为发育,压裂前期可优先激活形成缝网,但易发生压裂施工异常,导致裂缝扩展受限;FA2受沉积作用控制明显,易形成优势储集层与优势可压裂层的高密度交互;FA3和FA4受陆源物质影响较大,被改造能力较差,对缝网形成的促进作用不明显。总体上,FA1与FA2岩相组合是压裂施工的甜点。研究成果对储层压裂改造选井选层和压裂方案设计具有理论支撑和现场指导意义。
中图分类号:
表2
四川盆地龙马溪组页岩相组合及其矿物与力学实验参数"
样品号 | 相组合 | 矿物含量/% | TOC/% | 泊松比 | 杨氏模量/GPa | 泊杨脆性指数 | ||
碳酸盐矿物 | 长英质矿物 | 粘土矿物 | ||||||
S-18 | FA1 | 6.8 | 53.0 | 37.4 | 3.54 | 0.168 | 35.19 | 0.653 |
S-50 | FA1 | 8.2 | 60.8 | 28.3 | 4.77 | 0.177 | 37.00 | 0.668 |
S-52 | FA1 | 8.4 | 61.4 | 27.6 | 4.23 | 0.179 | 38.11 | 0.689 |
S-15 | FA2 | 7.3 | 53.5 | 38.3 | 3.45 | 0.163 | 36.79 | 0.710 |
S-19 | FA2 | 7.5 | 51.8 | 37.4 | 3.42 | 0.166 | 38.30 | 0.738 |
S-31 | FA2 | 10.8 | 46.7 | 39.6 | 2.30 | 0.170 | 38.32 | 0.725 |
S-35 | FA2 | 10.8 | 51.8 | 34.5 | 3.95 | 0.169 | 39.40 | 0.755 |
S-41 | FA2 | 9.9 | 60.4 | 26.7 | 5.51 | 0.181 | 38.60 | 0.695 |
S-23 | FA3 | 23.6 | 39.5 | 29.8 | 4.03 | 0.167 | 34.91 | 0.649 |
S-33 | FA3 | 10.2 | 51.9 | 35.1 | 3.46 | 0.178 | 37.81 | 0.685 |
S-43 | FA3 | 34.5 | 45.7 | 18.6 | 2.94 | 0.180 | 37.37 | 0.668 |
S-45 | FA3 | 32.4 | 41.4 | 25.1 | 2.99 | 0.181 | 37.57 | 0.669 |
S-6 | FA4 | 6.3 | 46.5 | 40.6 | 2.67 | 0.166 | 34.83 | 0.651 |
S-8 | FA4 | 11.0 | 47.7 | 42.8 | 3.22 | 0.168 | 35.33 | 0.657 |
S-12 | FA4 | 7.5 | 46.2 | 43.5 | 3.01 | 0.171 | 35.94 | 0.662 |
S-20 | FA4 | 9.0 | 40.9 | 47.0 | 3.77 | 0.165 | 32.48 | 0.595 |
S-22 | FA4 | 11.0 | 45.5 | 40.7 | 3.09 | 0.164 | 34.26 | 0.643 |
表3
川东南地区Y平台H1、H2、H3井施工异常段诊断分析结果"
单井 | 压裂段 | 页岩相组合 | 异常段分析 |
H1 | 2 | FA1 | 近井地带裂缝发育,滤失较大,扩展受限 |
10 | FA1 | 近井地带裂缝发育,滤失较大,扩展受限 | |
18 | FA1 | 滤失较大,缝宽受限,砂堵 | |
H2 | 3、5 | FA3 | 扩展受限,砂浓度提升受限,加砂困难 |
7 | FA2 | 压力陡升,扩展受限 | |
11 | FA1 | 压力陡升,砂敏感,扩展受限 | |
12 | FA1 | 扩展受限,砂浓度提升受限,加砂困难 | |
H3 | 1 | FA2 | 井筒污染严重 |
5 | FA3 | 天然缝网影响,动态缝宽不足,进砂通道受限 | |
9 | FA1 | 凝灰岩影响,砂堵,液体滤失量大,缝宽受限 | |
15 | FA3 | 砂堵,液体滤失量大,缝宽受限 |
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