石油勘探与开发 >

2017 , Vol. 44 >Issue 1: 40 - 47

DOI: https://doi.org/10.11698/PED.2017.01.05

油气勘探

塔里木盆地中深地区寒武系盐下白云岩油气来源及差异聚集

  • 张纪智 ,
  • 王招明 ,
  • 杨海军 ,
  • 徐志明 ,
  • 肖中尧 ,
  • 李中璇
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  • 1. 西南石油大学地球科学与技术学院,成都 610500;
    2. 中国石油塔里木油田勘探开发研究院,新疆库尔勒 841000
张纪智（1988-）,男,宁夏平罗人,西南石油大学在读博士研究生,主要从事矿产普查与勘探方面的研究。地址：四川省成都市新都区新都大道8号,西南石油大学地球科学与技术学院,邮政编码：610500。E-mail：171205447@qq.com

收稿日期: 2016-07-29

  修回日期: 2016-12-08

  网络出版日期: 2016-12-30

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Origin and differential accumulation of hydrocarbons in Cambrian sub-salt dolomite reservoirs in Zhongshen Area, Tarim Basin, NW China

  • ZHANG Jizhi ,
  • WANG Zhaoming ,
  • YANG Haijun ,
  • XU Zhiming ,
  • XIAO Zhongyao ,
  • LI Zhongxuan
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  • 1. School of Science and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korle 841000, China

Received date: 2016-07-29

  Revised date: 2016-12-08

  Online published: 2016-12-30

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摘要

基于塔里木盆地中深地区储集层样品、原油样品和天然气样品的地球化学特征分析,研究中深地区寒武系盐下白云岩油气来源及油、气差异聚集现象。通过质谱检测发现储集层及原油样品重排甾烷含量低、C28甾烷含量高,伽马蜡烷含量高,原油中存在芳基类异戊二烯烃化合物;通过天然气组成分析发现N2含量低,为0.24%~4.02%。由此判断油气来源于寒武系—下奥陶统烃源岩。中寒武统天然气δ13C1值为-51.4‰~-44.7‰,干燥系数为0.65~0.78,为原油伴生气;下寒武统天然气δ13C1值为-41.4‰~-40.6‰,干燥系数为0.99,为原油裂解气。塔里木盆地深层存在硫酸盐热化学还原反应生成的高含H2S裂解气的充注,中寒武统储集层物性差、裂缝网络体系不发育,故充注程度低,天然气中H2S含量低（0.003 8%~0.200 0%）;下寒武统储集层物性好、裂缝网络体系发育,故充注程度高,天然气中H2S含量也高（3.25%~8.20%）。综上,塔里木盆地中深地区寒武系盐下白云岩油气来源于寒武系—下奥陶统烃源岩,其差异聚集是储集层物性以及裂缝网络体系发育程度的综合影响所致。图4表4参34

关键词： 塔里木盆地; 中深地区; 盐下白云岩; 油气来源; 油气差异聚集

本文引用格式

张纪智 , 王招明 , 杨海军 , 徐志明 , 肖中尧 , 李中璇 . 塔里木盆地中深地区寒武系盐下白云岩油气来源及差异聚集[J]. 石油勘探与开发, 2017 , 44(1) : 40 -47 . DOI: 10.11698/PED.2017.01.05

Abstract

The origin and differential accumulation of hydrocarbons in the Cambrian sub-salt dolomite reservoirs in Zhongshen Area were studied based on comprehensive geochemical analysis of core samples, crude oil samples and natural gas samples. Mass spectrometric detection shows the core samples and crude oil samples are characterized by high C28 sterane content, low diasterane content, high gammacerane content and abundant aryl-Isoprenoids, and the associated gas has a low nitrogen content of 0.24%-4.02%, so it is inferred that the oil and gas are derived from Cambrian - Lower Ordovician source rock. The natural gas in the Middle Cambrian has a methane carbon isotope value of -51.4‰ - -44.7‰ and dryness coefficient of 0.65-0.78, representing associated gas, and the natural gas in the Lower Cambrian has a methane carbon isotope value of -41.4‰ - -40.6‰, and dryness coefficient of 0.99, representing cracking gas. The deep formations in the Tarim Basin contain cracking gas with high H2S content produced by thermo-chemical sulfate reduction (TSR). Due to the poorer reservoir properties and undeveloped fracture network system, the Middle Cambrian reservoirs have low charging degree of this kind of gas, so low H2S content (0.003 8%-0.200 0%); in contrast, with good reservoir properties and developed fracture network system, the Lower Cambrian reservoirs have a higher charging degree of this kind of gas, and thus high H2S content of 3.25%-8.20%. In summary, the oil and gas of Cambrian sub-salt dolomite reservoirs in Zhongshen Area are derived from Cambrian - Lower Ordovician source rock, and the differential accumulation of gas is the joint effect of reservoir physical property and development degree of fracture network system.

Key words： Tarim Basin; Zhongshen Area; sub-salt dolomite; hydrocarbon origin; hydrocarbon differential accumulation

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