天然气地球科学

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塔西南坳陷寒武系玉尔吐斯组烃源岩分布特征

崔海峰,田雷,张年春,刘军,张继娟   

  1. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020
  • 收稿日期:2015-06-08 修回日期:2015-08-17 出版日期:2016-04-10 发布日期:2016-04-10
  • 作者简介:崔海峰(1976-),男,陕西韩城人,高级工程师,博士,主要从事构造地质和油气成藏研究. E-mail:cuihf@petrochina.com.cn.
  • 基金资助:
    中国石油天然气股份有限公司重大科技专项专题子课题(编号:041012120005)资助.

Distribution characteristics of the source rocks from Cambrian Yuertusi Formation in the Southwest Depression of Tarim Basin

Cui Hai-feng,Tian Lei,Zhang Nian-chun,Liu Jun,Zhang Ji-juan   

  1. Research Institute of Petroleum Exploration & Development-Northwest,PetroChina,Lanzhou 730020,China
  • Received:2015-06-08 Revised:2015-08-17 Online:2016-04-10 Published:2016-04-10

摘要: 塔西南坳陷寒武系玉尔吐斯组烃源岩分布及发育模式认识是油气成藏的关键因素。利用盆地大测线恢复震旦纪末盆地古地貌,结合盆地内钻穿寒武系的11口钻井揭示信息,对比塔西南坳陷与北部坳陷震旦系—寒武系地震相特征,认为震旦纪末巴楚—麦盖提斜坡地区抬升,沉积水体较浅,在基底之上沉积了一套潮坪沉积,以其作为碳酸盐岩枢纽带南北两侧的塔西南坳陷和北部坳陷均发育震旦系—寒武系;震旦系沉积之上往往有寒武系玉尔吐斯组沉积,玉尔吐斯组的沉积与基底古地貌有关,基底隆起高部位无沉积。研究认为塔西南坳陷原地有玉尔吐斯组烃源岩发育,在麦盖提斜坡分布局限,受控于早加里东期正断层形成的洼槽,坳陷中段裂陷槽内烃源岩最为发育;昆仑山前区发育盆地相寒武系烃源岩,分布于震旦系楔状体之上,可与满加尔凹陷烃源岩发育特征对比。

关键词: 塔西南坳陷, 震旦系—寒武系, 玉尔吐斯组, 烃源岩分布, 正断层

Abstract: The distribution characteristics of the source rock from Cambrian Yuertusi Formation and its development pattern are key factors to reveal the process of oil and gas accumulation in the southwest depression of Tarim Basin.Based on the palaeogeomorphic form at the end of the Sinian resumed by 2D seismic data and the geological information from the eleven wells which drilled throughout Cambrian and the features of Sinian-Cambrian seismic facies of the Southwest Depression of Tarim Basin and the North Depression,it proposed that the lifting of Bachu Uplift and Maigaiti Slope at the end of Sinian resulted in a relatively shallow water deposition where there was a set of tidal flat sedimentary deposits on the basement of Tarim Basin,and Sinian-Cambrian deposited at its both sides named as Southwest Depression of Tarim Basin and North Depression.Generally,the Cambrian Yuertusi Formation deposited on the top of Sinian,and the high position was nondepositional area since the deposition of Yuertusi Formation was in connection with the basal sedimentary paleogeomorphology.The results obtained suggest that hydrocarbon source rocks of Yuertusi Formation developed in the southwest depression of the Tarim Basin.In the Maigaiti Slope,the distribution range of source rocks from Yuertusi Formation was limited and controlled by the trough formed by early Caledonian tensional fault,and the rifted trough in the middle of the Southwest Depression developed with great scale of hydrocarbon source rocks.Moreover,in the Kunlun Mountains,basin facies hydrocarbon source rocks,which distributed in the wedge shape of Sinian,also had more development,and its sedimentary environment could be well correlated with the Manjiaer Depression of Tarim Basin.

Key words: Southwest Depression of the Tarim Basin, Sinian-Cambrian, Yuertusi Formation, Hydrocarbon source rock distribution, Normal fault

中图分类号: 

  • TE122.3

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