琼东南盆地松西凹陷湖相烃源岩发育条件新认识与优质烃源岩刻画

付大巍; 胡德胜; 孙文钊; 宫立园; 何小胡; 陈奎; 雷新; 万阳

doi:10.11781/sysydz202302288

琼东南盆地松西凹陷湖相烃源岩发育条件新认识与优质烃源岩刻画

doi: 10.11781/sysydz202302288

1.
中海石油(中国)有限公司湛江分公司, 广东湛江 524057
2.
中海石油(中国)有限公司海南分公司, 海口 570312

基金项目:

中国海洋石油有限公司“十四五”重大科技专项“中国近海新区新领域勘探技术” KJGG2022-0301

详细信息

作者简介:
付大巍(1987-), 男, 硕士, 工程师, 从事石油勘探综合研究。E-mail: fudw1@cnooc.com.cn

中图分类号: TE122.1
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- 文章访问数: 227
- HTML全文浏览量: 93
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- 被引次数: 0
出版历程
- 收稿日期: 2022-10-31
- 修回日期: 2023-01-16
- 刊出日期: 2023-03-28

New understanding on development conditions of lacustrine source rocks and characterization of high-quality source rocks in Songxi Sag, Qiongdongnan Basin

1.
Zhanjiang Branch, CNOOC China Limited, Zhanjiang, Guangdong 524057, China
2.
Hainan Branch, CNOOC China Limited, Haikou, Hainan 570312, China

摘要

摘要: 针对琼东南盆地松西凹陷烃源岩发育机制不清、优质烃源岩分布不明的问题，根据已钻井原油地化特征、次洼沉积特征、地震相与属性特征、地震速度谱的对比分析，对松西凹陷东、西次洼始新统中深湖相烃源岩进行了预测，明确了松西凹陷沉降速率、物源注入点、凹陷结构三因素耦合控制了湖相烃源岩的发育与展布。松西凹陷西次洼紧邻大型物源注入点，为富砂沉积，从而导致较低的古生产力水平、较高的沉积速率和开放氧化的水体环境，不具备优质烃源岩形成的基本条件；东次洼远离大型物源注入点，仅发育小规模砂体，利于发育中—深湖相烃源岩。已钻井原油地化指标表明，研究区原油来自中深湖相烃源岩，证实松西凹陷存在优质烃源岩。始新统中深湖相烃源岩具有低频、连续、强反射地震特征，且具有低速异常，主要分布于东次洼的洼中及缓坡带。基于以上认识指导在东次洼部署钻井，首次在琼东南盆地钻遇始新统油页岩，且烃源岩指标好，提升了松西凹陷及琼东南盆地原油勘探前景。
- 优质烃源岩 /
- 充填模式 /
- 地震特征 /
- 松西凹陷 /
- 琼东南盆地
Abstract: With respect to the problems of unclear development mechanisms of source rocks and distribution of high-quality source rocks in the Songxi Sag, Qiongdongnan Basin, medium-deep lacustrine source rocks in eastern and western subsags of the Songxi Sag were predicted, according to geochemical characteristics of crude oil from drilled wells, sedimentary characteristics of these subsags, the characteristics of seismic facies and attributes, and comparison and analysis of seismic velocity spectrum. In this study, it was defined that the following three factors, namely, subsidence rate of the Songxi Sag, injection points in the provenance, and sag structure, coupled and controlled the development and distribution of lacustrine source rocks. Western subsag of the Songxi Sag was adjacent to large-scale injection points in the provenance as sand-rich sediments, and then led to low paleo-productivity level, high depositional rate, and open and oxidized water body setting. It had no fundamental conditions for the formation of high-quality source rocks. Eastern subsag was far from these large-scale injection points with the development of only small sand bodies, which was favorable for the development of medium-deep lacustrine source rocks. Geochemical indexes of crude oil from drilled wells indicated that the crude oil in the study area came from medium-deep lacustrine source rocks, which confirmed the occurrence of good source rocks in the Songxi Sag. Eocene medium-deep lacustrine source rocks had seismic characteristics of low frequency, continuous and strong reflectance in addition with low velocity anomalies that were mainly distributed in the center of eastern subsag and gentle slope zone. Above-mentioned understandings could guide well allocation in eastern subsag. Eocene oil shale was firstly encountered in the wells, Qiongdongnan Basin. These source rocks had good indexes and enhanced oil exploration prospect in the Songxi Sag, Qiongdongnan Basin.
- high-quality source rocks /
- infill pattern /
- seismic characteristics /
- Songxi Sag /
- Qiongdongnan Basin

HTML全文

图 1 琼东南盆地松西凹陷区域位置

Figure 1. Regional location of Songxi Sag, Qiongdongnan Basin

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图 2 琼东南盆地北部坳陷带始新世古地貌

Figure 2. Paleogeomorphy during Eocene, North Depression, Qiongdongnan Basin

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图 3 琼东南盆地松西凹陷构造演化史剖面

剖面位置见图 1的AA’。

Figure 3. Structural evolution profile through Songxi Sag, Qiongdongnan Basin

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图 4 琼东南盆地松西凹陷与南海北部富生烃凹陷沉降速率对比

Figure 4. Comparison of subsidence rates between Songxi Sag in Qiongdongnan Basin and sags rich in hydrocarbon in northern South China Sea

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图 5 琼东南盆地松西凹陷始新世古地貌及大型注入点分布

Figure 5. Eocene paleogeomorphology and distribution of large injection points in Songxi Sag, Qiongdongnan Basin

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图 6 琼东南盆地松西凹陷东次洼钻井地震剖面

剖面位置见图 5的BB’和CC’。

Figure 6. Well-seismic profile in eastern subsag of Songxi Sag, Qiongdongnan Basin

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图 7 琼东南盆地松西凹陷Y9井原油地化指标分析

Figure 7. Crude oil geochemical indexes in well Y9, Songxi Sag, Qiongdongnan Basin

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图 8 琼东南盆地松西凹陷东、西次洼始新统地层速度谱对比

剖面位置见图 5的BB’和DD’。

Figure 8. Eocene stratigraphic velocity spectrum in eastern and western subsags, Songxi Sag, Qiongdongnan Basin

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图 9 琼东南盆地松西凹陷东、西次洼地震剖面

剖面位置见图 5的EE’。

Figure 9. Seismic profile across eastern and western subsags, Songxi Sag, Qiongdongnan Basin

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图 10 琼东南盆地松西凹陷始新世沉积相平面分布

Figure 10. Planar map of Eocene sedimentary facies in Songxi Sag, Qiongdongnan Basin

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图 11 琼东南盆地松西凹陷烃源属性与优质烃源岩厚度

Figure 11. Hydrocarbon source attribute and thickness of high-quality source rocks in Songxi Sag, Qiongdongnan Basin

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图 12 琼东南盆地松西凹陷B-6井综合柱状图(a)及油页岩照片(b)

Figure 12. Comprehensive stratigraphic column and oil shale photographs of well B-6 in Songxi Sag, Qiongdongnan Basin

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