天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 970–979.doi: 10.11764/j.issn.1672-1926.2020.02.007

• 天然气地质学 • 上一篇    下一篇

琼东南盆地深水东区古潜山领域天然气来源及运移表征

李兴(),甘军,杨希冰,梁刚,汪紫菱   

  1. 中海石油(中国)有限公司湛江分公司,广东 湛江 524057
  • 收稿日期:2019-12-10 修回日期:2020-03-01 出版日期:2020-07-10 发布日期:2020-07-02
  • 作者简介:李兴(1986-),男,湖北黄冈人,工程师,硕士,主要从事石油天然气地质勘探研究. E-mail:lixing4@cnooc.com.cn.
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(2016ZX05026-002)

Characterization of natural gas migration in the ancient buried hill, east deep water area of Qiongdongnan Basin

Xing LI(),Jun GAN,Xi-bin YANG,Gang LIANG,Zi-ling WANG   

  1. Zhanjiang Branch of CNOOC Ltd. , Zhanjiang 524057, China
  • Received:2019-12-10 Revised:2020-03-01 Online:2020-07-10 Published:2020-07-02
  • Supported by:
    The China National Science and Technology Major Project(2016ZX05026-002)

摘要:

琼东南盆地深水东区近年来有较大的天然气勘探突破,但天然气运移表征方面的研究还比较欠缺,制约了进一步勘探成效。通过深水东区气源对比、天然气运移路径及成藏定量表征等分析,明确了深水东区前古近系古潜山天然气运移成藏机理。研究表明,深水东区古近系古潜山天然气主要来源于松南—宝岛凹陷近凹—斜坡带高效生烃灶,在超压和浮力作用下通过大型入洼构造脊连片滨海相砂岩、潜山砂质风化壳和风化裂缝带复合输导体系优势聚集,并基于流体势和输导体系差异定量计算指出往南部松南低凸起是主运移方向,认为深水东区天然气勘探最有利区块为靠近斜坡带的Y1区古潜山。

关键词: 深水东区, 天然气运移路径, 定量表征, 有效供烃灶, 古潜山

Abstract:

In recent years, there has been a significant breakthrough in natural gas exploration of east deep water area of Qiongdongnan Basin, but the research on the characterization of natural gas migration is still lacking, which limits the effectiveness of further exploration. Through the analysis of gas source correlation, natural gas migration path and quantitative accumulation characterization in the east deep water area, the mechanism of natural gas migration and accumulation in the paleo buried hills of Pre-Paleogene was clarified. The research shows that the natural gas of Paleogene and paleo-buried hill in eastern part of the deep water mainly originated from high-efficiency hydrocarbon-generating stoves which located in slope-near concave zone of the Songnan-Baodao Sag. Natural gas has accumulated under the action of overpressure and buoyancy by a large scale intrusion tectonic ridges including continuous littoral sandstone, buried hill sandy weathered crust and weathered fracture moreover quantitative calculation of fluid potential and transport system differences indicate that the south Songnan low uplift is the main migration direction. It is believed that the most favorable area for natural gas exploration in east deep water is ancient buried hill of Y1 area near the slope zone.

Key words: East deep water, Natural gas migration path, Quantitative characterization, Effective hydrocarbon stove, Buried hill

中图分类号: 

  • TE122.1

图1

琼东南盆地构造区划分示意"

图2

松南—宝岛凹陷结构"

表1

琼东南盆地深水东区天然气组分、碳同位素特征"

构造带井号样品类型层位天然气碳同位素/‰干燥系数烃类含量/%
δ13C1δ13C2δ13C3
近凹带ST36-2MDT三亚组-37-27.4-27.90.8796.6
低凸起区Y8-1(1井)MDT崖城组-45.2-28.4-27.80.9798.5
前古近系-44.9-27.4-27.70.9798.1
Y8-1(2井)MDT三亚组-45.5-27.5-27.60.9897.6
崖城组-44-27.1-27.80.9895.9
前古近系-42.7-26.9/0.9975.7
Y8-3(1井)DST前古近系-43.2-26.8-26.50.9798.9
Y8-3(2井)MDT崖城组-43.3-26.7-26.50.9796.9
前古近系-43.4-26.7-26.40.9798.9

图3

琼东南盆地深水区天然气碳同位素分布特征"

图4

琼东南盆地泥岩干酪根碳同位素分布特征"

图5

琼东南盆地深水东区崖城组烃源岩压力分布特征"

图6

琼东南盆地东部已钻井孔隙度与深度关系"

图7

深水东区基底流体势平面等值线图"

图8

松南—宝岛凹陷成藏模式"

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