石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (6): 1665-1677.doi: 10.11743/ogg20240613
周立宏1(), 陈长伟1, 韩国猛1, 李宏军1, 崔宇1,2(), 董晓伟1, 宋舜尧1, 蒲秀刚1, 刘国全1, 甘华军2
收稿日期:
2024-04-18
修回日期:
2024-11-04
出版日期:
2024-12-30
发布日期:
2024-12-31
通讯作者:
崔宇
E-mail:zhoulh@petrochina.com.cn;dg_cuiyu@ petrochina.com.cn
第一作者简介:
周立宏(1968—),男,博士、教授级高级工程师,油气勘探研究与生产管理。E-mail: zhoulh@petrochina.com.cn。
基金项目:
Lihong ZHOU1(), Changwei CHEN1, Guomeng HAN1, Hongjun LI1, Yu CUI1,2(), Xiaowei DONG1, Shunyao SONG1, Xiugang PU1, Guoquan LIU1, Huajun GAN2
Received:
2024-04-18
Revised:
2024-11-04
Online:
2024-12-30
Published:
2024-12-31
Contact:
Yu CUI
E-mail:zhoulh@petrochina.com.cn;dg_cuiyu@ petrochina.com.cn
摘要:
近年来,深层煤岩气勘探逐渐成为热门的非常规勘探领域,中国深层煤岩气的勘探主要集中在鄂尔多斯盆地,勘探与开发先导试验取得了重要突破,渤海湾盆地深层煤岩气勘探尚处于起步阶段。通过煤层岩心、测井和录井等地质资料,系统分析了大港探区上古生界深层煤层特征和有利成藏因素等,剖析了深层煤层生气、存储和保存机制,明确了上古生界深层煤岩气的发育模式。研究认为:① 大港探区上古生界深层煤岩气发育多套有利的甜点层段,煤层有机质丰度高,演化程度中等,生气强度较大。② 煤层具有多尺度孔缝结构,密集微裂缝规模发育提供了有效的储集空间。③ 煤层顶、底板以泥岩为主,保存条件较好。④ 受多期构造运动影响,煤层两次规模生气,复杂断陷背景下存在煤层风化-降解带、饱和吸附带和构造成藏带,深层煤层具有“超饱和”含气特征,煤层吸附气与游离气并存。据此建立了复杂断陷盆地深层煤岩气复式聚集发育模式,大港探区上古生界深层煤岩气理论研究与勘探实践对于渤海湾盆地深层煤岩气的勘探开发具有重要的指导与借鉴意义。
中图分类号:
表1
大港探区石炭系-二叠系不同岩性测井解释识别标志数据"
岩性 | 自然伽马值/API | 声波时差/(μs/m) | 补偿中子孔隙度/% | 补偿密度/(g/cm3) | 光电吸收截面指数/(b/e) | 电阻率/(Ω·m) |
---|---|---|---|---|---|---|
煤 | 15 ~ 35 | 300 ~ 450 | >50 | 1.20 ~ 1.80 | 0.15 ~ 0.20 | >100.0 |
炭质泥岩 | 60 ~ 140 | 250 ~ 450 | >40 | 1.80 ~ 2.30 | 2.00 ~ 3.45 | 0.3 ~ 10.0 |
泥岩 | 70 ~ 140 | 240 ~ 350 | 30 ~ 80 | 2.25 ~ 2.65 | 3.40 ~ 3.45 | 0.3 ~ 10.0 |
砂岩 | 30 ~ 85 | 175 ~ 280 | 10 ~ 35 | 2.40 ~ 2.80 | 1.80 ~ 1.84 | 10.0 ~ 200.0 |
表2
渤海湾盆地与鄂尔多斯盆地煤层显微组成数据对比"
盆地 | 区块 | 显微组分含量/% | |||
---|---|---|---|---|---|
镜质组 | 惰质组 | 壳质组 | 矿物质 | ||
渤海湾 | 黄骅 | 68.45 ~ 85.82/78.30 | 2.00 ~ 28.79/13.50 | 1.94 ~ 2.13/2.04 | 0.42 ~ 3.60/2.80 |
冀中 | 72.63 ~ 81.00/76.50 | 7.54 ~ 21.60/16.20 | 0.80 ~ 13.64/7.30 | 1.20 ~ 6.80/3.80 | |
鄂尔多斯 | 保德 | 67.30 | 9.50 | 21.30 | 1.90 |
大宁—吉县 | 43.70 ~ 86.80/64.00 | 11.20 ~ 40.40/19.41 | — | 10.60 ~ 32.00/18.57 | |
韩城 | 46.47 ~ 87.54/76.94 | 6.54 ~ 35.21/15.39 | — | 1.15 ~ 18.32/7.38 | |
柳林 | 77.30 ~ 77.70 | 17.80 ~ 21.20 | <1.00 | — | |
临兴—神府 | 52.90 ~ 86.20/67.80 | 8.80 ~ 37.60/23.10 | 0.80 ~ 12.00/4.30 | 0.80 ~ 12.00/4.10 | |
石楼南 | 74.90 ~ 84.90/80.50 | 15.10 ~ 25.20/19.20 | — | 6.20 ~ 22.80/14.80 |
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