渤海湾盆地惠民凹陷临南洼陷沙河街组现今超压分布特征及成因

霍智颖; 何生; 王永诗; 郭小文; 朱钢添; 赵文

doi:10.11781/sysydz202006938

渤海湾盆地惠民凹陷临南洼陷沙河街组现今超压分布特征及成因

doi: 10.11781/sysydz202006938

1.
中国地质大学(武汉) 构造与油气资源教育部重点实验室, 武汉 430074
2.
中国石化胜利油田分公司, 山东东营 257015

基金项目:

国家“十三五”科技重大专项任务 2016ZX05006003-001

国家“十三五”科技重大专项任务 2017ZX05005001-008

详细信息

作者简介:
霍智颖(1994-), 女, 硕士研究生, 从事超压与油气成藏研究。E-mail: davidsonite@163.com

通讯作者:
何生(1956-), 男, 教授, 博士生导师, 从事油气地质及地球化学研究。E-mail: shenghe@cug.edu.cn

中图分类号: TE122.23
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出版历程
- 收稿日期: 2020-01-03
- 修回日期: 2020-09-09
- 刊出日期: 2020-11-28

Distribution and causes of present-day overpressure of Shahejie Formation in Linnan Subsag, Huimin Sag, Bohai Bay Basin

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China
2.
SINOPEC Shengli Oilfield Company, Dongying, Shandong 257015, China

摘要

摘要: 临南洼陷是渤海湾盆地济阳坳陷惠民凹陷中的主要富烃洼陷，油气田主要分布在洼陷内及其南北两侧的断裂构造带，临南洼陷深部沙河街组超压较发育。利用钻井、钻杆测压（DST）、测井和地震资料，结合Eaton超压预测经验公式，对砂岩实测压力特征、超压测井响应、超压剖面和平面分布特征以及成因进行了研究。临南洼陷沙河街组砂岩DST实测超压深度约为3 005~4 355 m，剩余压力约为7.95~30.45 MPa，压力系数约为1.21~1.78；超压带内的泥岩和砂岩均表现为偏离正常趋势的高声波时差响应特征，并对应泥岩高电阻率异常；层位上沙四上亚段至沙三中、下亚段地层主要发育弱超压，局部出现中—强超压；剖面上深洼区超压带分布的深度范围约在3 000~4 500 m；平面上发育多个小的中—强超压区，超压区主要分布在深洼区和中央断裂带范围，超压顶界面深度约为2 500~3 700 m。临南洼陷古近系砂岩占比高是超压发育比较局限的主要控制因素。该凹陷超压砂岩储层主要为含油层，含烃流体充注为临南洼陷深层沙三、四段砂岩超压的主要原因；优质烃源岩埋深大，超压烃源岩镜质体反射率约为0.5%~1.5%，处于生油阶段且不具有低密度特征，表明生油作用是烃源岩增压的主要因素。
- 超压测井响应 /
- 超压分布 /
- 超压成因 /
- 沙河街组 /
- 临南洼陷 /
- 惠民凹陷 /
- 渤海湾盆地
Abstract: The Linnan Subsag is a main hydrocarbon generating area in the Huimin Sag of the Jiyang Depression, Bohai Bay Basin. Oilfields mainly are in the subsag or on the southern and northern faults. Overpressure is found in the Shahejie Formation. Drilling, drill stem test (DST), logging and seismic data as well as the Eaton formula were applied to study the measured pressure characteristics in sandstones, the correspondence between logging and overpressure in both sandstones and shales, and the plane and profile distributions and causes of overpressure. The overpressure depth from DST ranges 3 005 to 4 355 m in sandstones of the Shahejie Formation, the residual pressure is 7.95 to 30.45 MPa, and the pressure coefficient is 1.21 to 1.78. Logged acoustic velocity of shale and sandstone in the overpressure zone is higher than that in the normal pressure zone, and the logged resistance of the overpressure zone is also higher than that of the normal pressure zone. The upper section of the fourth member and the middle and lower sections of the third member of Shahejie Formation mainly develop low overpressure, while medium and strong overpressure also exist regionally. Vertically, overpressure zones mainly occur from 3 000 to 4 500 m depth. There are several medium and strong overpressure zones, mainly in the deep sag and fault zone. The top depth of overpre-ssure zone is 2 500-3 700 m. The high percentage of sandstone leads to the limited distribution of overpressure in the Linnan Subsag. The overpressured sandstone reservoirs in this sag are mainly oil-bearing layers. Hydrocarbon-bearingfluid charging is the main reason for the overpressure of sandstones in the third and fourth members of Shahejie Formation in the Linnan Subsag. The high-quality source rocks are deeply buried. The vitrinite reflectance of the overpressured source rocks is about 0.5% to 1.5%. It is in the oil generation stage and does not have low density characteristics, indicating that oil generation is the main reason for the pressurization of source rocks.
- correspondences from logging to overpressure /
- overpressure distribution /
- causes of overpressure /
- Shagejie Formation /
- Linnan Subsag /
- Huimin Sag /
- Bohai Bay Basin

HTML全文

图 1 渤海湾盆地惠民凹陷构造纲要和临南洼陷研究区及典型钻井位置

Figure 1. Structural units of Huimin Sag and studied area with typical drill sites in Linnan Subsag, Bohai Bay Basin

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图 2 渤海湾盆地临南洼陷沙河街组砂岩钻杆测试(DST)实测地层压力与深度关系

Figure 2. Relationship between measured pressure and depth from drill stem test (DST) data of sandstones in Shahejie Formation, Linnan Subsag, Bohai Bay Basin

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图 3 渤海湾盆地临南洼陷夏941井和夏942井泥岩与砂岩超压测井响应及压力预测

Figure 3. Response characteristics to overpressure in mudstones and sandstones with predicted pressures in wells Xia 941 and Xia 942, Linnan Subsag, Bohai Bay Basin

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图 4 渤海湾盆地临南洼陷盘22井—曲古2井连井压力系数和超压带发育位置

剖面位置见图 5。

Figure 4. Overpressure distribution superimposed on oil reservoirs crossing wells Pan 22 to Qugu 2 in Linnan Subsag, Bohai Bay Basin

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图 5 渤海湾盆地临南洼陷超压顶界面深度平面分布

Figure 5. Plane distribution of the upper overpressure interface depth in Linnan Subsag, Bohai Bay Basin

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图 6 渤海湾盆地临南洼陷沙三、四段超压带泥岩、砂岩预测压力最高值压力系数平面分布

Figure 6. Plane distribution of maximum predicted pressure coefficients of mudstones and sandstones in the overpressure zone of the third and fourth members of Shahejie Formation in Linnan Subsag, Bohai Bay Basin

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图 7 渤海湾盆地临南洼陷烃源岩镜质体反射率、岩石热解S₁含量、砂岩碳酸盐和硅质胶结物含量与深度关系

Figure 7. Variation of geochemical parameters of source rock and cement content vs. depth in Linnan Subsag, Bohai Bay Basin

下载: 全尺寸图片幻灯片

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