莺歌海凹陷东斜坡L气田天然气成因及运移模式

杨计海; 黄保家

doi:10.11698/PED.2019.03.04

石油勘探与开发 >

2019 , Vol. 46 >Issue 3: 450 - 460

DOI: https://doi.org/10.11698/PED.2019.03.04

油气勘探

莺歌海凹陷东斜坡L气田天然气成因及运移模式

杨计海 ,
黄保家

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中海石油（中国）有限公司湛江分公司,广东湛江 524057

杨计海（1964-）,男,广东阳江人,硕士,中海石油（中国）有限公司湛江分公司教授级高级工程师,主要从事石油地质综合研究和技术管理工作。地址：广东省湛江市坡头区南调路22号信箱,邮政编码：524057。E-mail: yangjh@cnooc.com.cn

收稿日期: 2019-01-31

修回日期: 2019-04-10

网络出版日期: 2019-05-25

基金资助

国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术研究”（2016ZX05024-005）

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Origin and migration model of natural gas in L gas field, eastern slope of Yinggehai Sag, China

YANG Jihai ,
HUANG Baojia

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Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China

Received date: 2019-01-31

Revised date: 2019-04-10

Online published: 2019-05-25

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摘要

基于天然气组成、轻烃和同位素数据以及相关地质资料,对莺歌海凹陷东斜坡L岩性圈闭气田天然气的成因类型、来源以及运移进行研究。结果显示,L气田天然气组成变化较大,烃类含量为33.6%~91.5%,CO₂含量为0.5%~62.2%,干燥系数达0.94~0.99;烷烃气的δ¹³C₁值为-40.71‰~-27.40‰、δ¹³C₂值为-27.27‰~-20.26‰,C₅—C₇轻烃内组成的异构烷烃含量为55%~73%,属于煤型气,主要来自中新统陆源富有机质烃源岩;当CO₂在天然气中的含量大于10%时,其δ¹³C_CO2值为-9.04‰~-0.95‰,与之伴生的氦气³He/⁴He值为7.78×10^-8,属壳源无机成因,深部地层钙质泥岩及碳酸盐岩等热分解生成的CO₂是其主要来源。天然气存在3种运移方式：储集层邻近的中新统烃源岩接触式供烃、中新统梅山组—三亚组烃源岩生成高成熟气通过隐伏断裂垂向充注、沿砂体侧向运移;较大的“源- 储”压差是重要的运移驱动力,短距离运移及有效的“源-储”配置控制天然气分布。图12表1参30

关键词： 莺歌海凹陷东斜坡; 岩性圈闭气田; 煤型气; 壳源无机CO₂; 气-源对比; 运移模式

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杨计海 , 黄保家 . 莺歌海凹陷东斜坡L气田天然气成因及运移模式[J]. 石油勘探与开发, 2019 , 46(3) : 450 -460 . DOI: 10.11698/PED.2019.03.04

Abstract

Based on the chemical and stable carbon isotopic composition of natural gas and light hydrocarbons, along with regional geological data, the genetic type, origin and migration of natural gases in the L lithologic gas field, the eastern slope of Yinggehai Sag were investigated. The results show that these gases have a considerable variation in chemical composition, with 33.6%-91.5% hydrocarbon, 0.5%-62.2% CO₂, and dryness coefficients ranging from 0.94 to 0.99. The alkane gases are characterized by δ¹³C₁ values of -40.71‰--27.40‰, δ¹³C₂ values of -27.27‰--20.26‰, and the isoparaffin contents accounting for 55%-73% of the total C₅-C₇light hydrocarbons. These data indicate that the natural gases belong to the coal-type gas and are mainly derived from the Miocene terrigenous organic-rich source rocks. When the CO₂ contents are greater than 10%, the δ¹³C_CO2 values are -9.04‰ to - 0.95‰ and the associated helium has a ³He/⁴He value of 7.78×10^-8, suggesting that the CO₂ here is crustal origin and inorganic and mainly sourced from the thermal decomposition of calcareous mudstone and carbonate in deep strata. The gas migrated in three ways, i.e., migration of gas from the Miocene source rock to the reservoirs nearby; vertical migration of highly mature gas from deeper Meishan and Sanya Formations source rock through concealed faults; and lateral migration along permeable sandbodies. The relatively large pressure difference between the “source” and “reservoir” is the key driving force for the vertical and lateral migration of gas. Short-distance migration and effective “source - reservoir” match control the gas distribution.

Key words： eastern slope of Yinggehai Sag; L lithologic gas field; coal-type gas; crustal inorganic CO₂; gas-source correlation; migration model

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