准噶尔盆地陆梁隆起东部滴北凸起天然气成因来源再认识

卫延召, 宋志华, 奇瑞, 王伟, 龚德瑜, 王峰

doi:10.11764/j.issn.1672-1926.2019.03.012

天然气地球科学 >

2019 , Vol. 30 >Issue 6: 840 - 849

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.03.012

天然气地质学

准噶尔盆地陆梁隆起东部滴北凸起天然气成因来源再认识

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1.中国石油勘探开发研究院，北京 100083；
2.中国石油新疆油田公司勘探事业部，新疆克拉玛依 834000；
3.中国石油新疆油田公司生产运行处，新疆克拉玛依 834000；
4.中国石油东方地球物理公司乌鲁木齐分院，新疆乌鲁木齐 830000；
5.中国石油新疆油田公司勘探开发研究院，新疆克拉玛依 834000

卫延召(1972-)，男，河南洛阳人，高级工程师，博士，主要从事准噶尔盆地及北疆地区油气成藏规律及油气勘探区带和目标评价研究.E-mail：weiyanzhao@petrochina.com.cn.

收稿日期: 2019-02-15

修回日期: 2019-03-19

网络出版日期: 2019-08-05

基金资助

国家科技重大专项“准噶尔盆地岩性地层油气藏分布规律与目标评价”(编号：2017ZX05001-004)资助.

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Re-examination of genetic types and origins of natural gases from Dibei Uplift，eastern Luliang Uplift，Junggar Basin

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1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
2.Exploration Department,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;
3.Department of Production Operation,Xinjiang Oilfield Company，Petrochina,Karamay 834000,China;
4.Urumchi Branch,Eastern Geophysical Company,PetroChina,Urumchi 830000,China;
5.Research Institute of Petroleum Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2019-02-15

Revised date: 2019-03-19

Online published: 2019-08-05

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摘要

陆梁隆起东部地区是准噶尔盆地天然气勘探的主战场。目前，在滴南凸起及周缘已经发现了一批大、中型气田(藏)。位于滴南凸起以北的滴北凸起被多个生烃凹陷环绕，发育多套烃源岩层系，天然气成藏条件十分优越。研究基于滴北凸起9个天然气样品分子和稳定碳同位素组成，并与滴南凸起天然气地球化学特征开展对比研究，结合主要烃源岩层系的埋藏史和生烃史，全面系统地梳理了滴北凸起天然气成因来源及遭受的次生改造作用。滴北凸起天然气的成因来源复杂，主要存在3类天然气：第一类是上石炭统巴山组煤系烃源岩生成的高熟煤成气；第二类是下石炭统姜巴斯套组／松喀尔苏组海相烃源岩在高成熟阶段生成的油型气；第三类是原油遭受生物降解后形成的次生生物甲烷。滴北凸起原生热成因气现今处于高成熟阶段，其非烃气体含量、稳定碳同位素组成和热成熟度等特征都与滴南凸起天然气存在显著差别，天然气的成熟度与乌伦古坳陷烃源岩匹配程度更好，推断其来自乌伦古坳陷。

关键词： 准噶尔盆地; 滴北凸起; 乌伦古坳陷; 煤成气; 油型气; 次生生物甲烷

本文引用格式

卫延召, 宋志华, 奇瑞, 王伟, 龚德瑜, 王峰 . 准噶尔盆地陆梁隆起东部滴北凸起天然气成因来源再认识[J]. 天然气地球科学, 2019 , 30(6) : 840 -849 . DOI: 10.11764/j.issn.1672-1926.2019.03.012

Abstract

The eastern part of Luliang Uplift has currently become the main target for gas exploration in the Junggar Basin.By now，several giant-medium gas fields (reservoirs)are discovered in the Dinan Uplift.Located north to the Dinan Uplift，the Dibei Uplift is surrounded by several hydrocarbon generating sags and developed several sets of source rocks，which promises a favorable gas accumulation condition.Based on molecular and stable carbon isotopic compositions of 9 gas samples from Dibei Uplift，in cooperation with the burial and hydrocarbon generation history of source rocks，genetic types and origins of natural gases and related secondary alterations were fully discussed in this study.A comparative study was also carried out with the geochemical characteristics of natural gases from Dinan Uplift.Gases from Dibei Uplift have complicated origins which could primarily be divided into three types:(1)Highly-mature coal-derived gas generated from the Upper Carboniferous Bashan coal measures;(2)Highly-mature oil-type gas generated from the marine source rocks in the Lower Carboniferous Jiangbasitao Formation or Songkaersu Formation);(3)Secondary microbial methane generated via the biodegradation of oils.Significant differences have been observed between gases from Dibei and Dinan Uplifts in the concentration of non-hydrocarbon gases，carbon isotopes and thermal maturities.Gases from the Dibei Uplift are at highly mature stage，which correlates well with the maturities of Carboniferous source rocks in the Wulungu Depression.Thus，these gases are most probably derived from the Wulungu Depression.

Key words： Junggar Basin; Dibei Uplift; Wulungu Depression; Coal-derived gas; Oil-type gas; Secondary microbial methane

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