天然气地球化学

塔里木盆地麦盖提斜坡罗斯2井油气地球化学特征及油气源分析

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  • 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;
    2.中国石油塔里木油田分公司,新疆 库尔勒 841000
朱心健(1991-),男,湖北广水人,硕士研究生,主要从事油气地球化学等研究工作. E-mail:xjzhus@163.com.

收稿日期: 2017-01-22

  修回日期: 2017-03-01

  网络出版日期: 2017-04-10

基金资助

国家科技重大专项(编号:2016ZX05007-003)资助.

Geochemical characteristics and source correlation of hydrocarbons in the Well Luosi 2 of Maigaiti Slope,Tarim Basin,China

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  • 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;
    2.PetroChina Tarim Oil field Company,Korla 841000,China

Received date: 2017-01-22

  Revised date: 2017-03-01

  Online published: 2017-04-10

摘要

巴楚隆起麦盖提斜坡是塔里木盆地西部的重要构造单元,部署在麦盖提斜坡带上的重点探井罗斯2井在奥陶系底部的蓬莱坝组获得成功,在该区新层系的油气勘探获得突破。阐明罗斯2井油气的成因、来源对该区下一步的油气勘探具有重要的意义。通过系统研究罗斯2井原油、天然气地球化学特征,探讨罗斯2井的油气源以及成因特征,研究表明罗斯2井原油中甾萜类等生物标志化合物含量很低,受热演化影响较为明显,基本不能作为生源或其他地球化学特征的判识参数,而原油的金刚烷、甲基菲等成熟度参数表明其成熟度较高,与该区的寒武系烃源岩可比,全油的碳同位素组成偏重,综合原油的地球化学特征并与烃源岩对比认为其应来源于中上寒武统烃源岩。罗斯2井天然气干燥系数较高,天然气碳同位素组成偏重,为典型高_过成熟干气,并根据与原油的相关关系认为也应来自于中上寒武统烃源岩。

本文引用格式

朱心健,陈践发,贺礼文,王艺繁,张威,张宝收,张科 . 塔里木盆地麦盖提斜坡罗斯2井油气地球化学特征及油气源分析[J]. 天然气地球科学, 2017 , 28(4) : 566 -574 . DOI: doi:10.11764/j.issn.1672-1926.2017.03.001

Abstract

Maigaiti Slope,Bachu Uplift is one of important tectonic units in the west of the Tarim Basin.The Well Luosi 2,which was placed on the Maigaiti slope belt,succeeded in the Penglaiba Formation at the bottom of the Ordovician making a significant breakthrough in oil and gas exploration in new layer.In this paper,the geochemical characteristics of oil and gas of the Well Luosi 2 are studied systematically to discuss the sources and the genetic characteristics of the oil and gas.The results reveal that the crude oil in Well Luosi 2 has a very low level of biomarkers constrained by thermal evolution such as steroidal terpenes and so on,and could not be used as an identification parameter to identify the origin or other geochemical characteristics.Meanwhile,the matured parameters such as adamantane and methyl phenanthrene of crude oil indicate that the mature degree of the crude oil is high that is similar with the Cambrian source rock in this area.The carbon isotope of the whole oil is heavy.Based on the geochemical characteristics of crude oil and the comparison with hydrocarbon source rocks,it should be derived from the Upper Cambrian source rock.For the natural gas of Well Luosi 2,the results reveal that it has a high drying coefficient and the carbon isotope of natural gas is heavy and it should also be derived from the Middle-Upper Cambrian hydrocarbon source,according to the correlation with the crude oil.

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