Nanhua-Sinian rift distribution and its relationship with the development of Lower Cambrian source rocks in the southwest depression of Tarim Basin

doi:10.7623/syxb201604002

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (4): 430-438.DOI: 10.7623/syxb201604002

• Petroleum Exploration • Previous Articles Next Articles

Nanhua-Sinian rift distribution and its relationship with the development of Lower Cambrian source rocks in the southwest depression of Tarim Basin

Cui Haifeng, Tian Lei, Zhang Nianchun, Liu Jun

Northwest Branch, PetroChina Research Institute of Petroleum Exploration & Development, Gansu Lanzhou 730020, China

Received:2015-09-15 Revised:2016-02-18 Online:2016-04-25 Published:2016-05-06

塔西南坳陷南华纪-震旦纪裂谷分布及其与下寒武统烃源岩的关系

崔海峰, 田雷, 张年春, 刘军

中国石油勘探开发研究院西北分院甘肃兰州 730020

通讯作者: 崔海峰,男,1976年5月生,2000年获西北大学学士学位,2011年获成都理工大学博士学位,现为中国石油勘探开发研究院西北分院高级工程师,主要从事构造地质和油气综合研究工作。Email:cuihf@petrochina.com.cn
作者简介:崔海峰,男,1976年5月生,2000年获西北大学学士学位,2011年获成都理工大学博士学位,现为中国石油勘探开发研究院西北分院高级工程师,主要从事构造地质和油气综合研究工作。Email: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1子课题(041012120005)资助。

Abstract

Abstract:

The distribution of Nanhua-Sinian rift is closely related to the development of source rocks in the southwest depression of Tarim Basin. Based on outcrop data and the information of drilling wells and seismic profiles in West Kunlun, tectonic setting and distribution characteristics of the Nanhua-Sinian rift were analyzed, and the relationship between rift development and the distribution of Cambrian source rocks was also explored. The research results suggest that Nanhua-Sinian rift was located in the southern margin of Tarim block and formed in the initial stage of Rodinia supercontinent cracking, extending from Shache, Yecheng and Pishan area of Kunlun Foreland to Maigaiti slope in NE-trending distribution with the boundaries controlled by normal fault. A tectonic sedimentary assemblage of the rift developed towards depression and the continental facies towards marine facies existed in Nanhua-Sinian rift. The distribution of overlying Cambrian bottom source rocks was controlled by the development of Nanhua-Sinian rift. The sedimentation of Cambrian source rocks was closely related to the paleo-terrain at Sinian end. The drilling results have proved that Yurtusi Formation was often developed in the Upper Sinian dolomite sedimentary areas. The Upper Sinian dolomite showed the seismic reflection characteristics with continuous stratified medium-high amplitude, which could be well identified on seismic profile, conductive to reflect the distribution range of source rocks in Yurtusi Formation indirectly. The Cambrian source rocks in Yurtusi Formation in the southwest depression of Tarim Basin were mainly distributed in the Kunlun Mountain front zones and the rift development zones in the central depression.

Key words: Southwest depression of Tarim Basin, Nanhua-Sinian, rift, source rocks, dolomite

摘要：

塔西南坳陷南华纪-震旦纪裂谷分布与烃源岩发育关系密切。综合西昆仑露头资料、钻井信息和地震剖面信息,分析了南华纪-震旦纪裂谷形成的大地构造背景和展布特征,探讨了裂谷发育与下寒武统烃源岩分布的关系。研究认为,塔西南坳陷发育南华纪-震旦纪裂谷,处于塔里木地块南缘,形成于Rodinia超大陆裂解初期,由昆仑山前的莎车、叶城和皮山地区延伸至麦盖提斜坡,呈NE向展布,边界为正断层控制,南华系-震旦系发育断陷转向坳陷、陆相转向海相的构造沉积组合。南华纪-震旦纪裂谷发育控制着上覆寒武系底部烃源岩分布,寒武系烃源岩的沉积与震旦纪末古地貌关系密切。钻井证实有上震旦统白云岩沉积的区域往往有玉尔吐斯组发育,上震旦统白云岩地震反射特征为连续层状中强振幅,地震剖面上较好识别,有助于间接反映玉尔吐斯组烃源岩分布范围。塔西南坳陷寒武系玉尔吐斯组烃源岩主要分布在昆仑山前带和坳陷中部裂谷发育区内。

关键词: 塔西南坳陷, 南华纪-震旦纪, 裂谷, 烃源岩, 白云岩

CLC Number:

TE122.14

Cui Haifeng, Tian Lei, Zhang Nianchun, Liu Jun. Nanhua-Sinian rift distribution and its relationship with the development of Lower Cambrian source rocks in the southwest depression of Tarim Basin[J]. Acta Petrolei Sinica, 2016, 37(4): 430-438.

崔海峰, 田雷, 张年春, 刘军. 塔西南坳陷南华纪-震旦纪裂谷分布及其与下寒武统烃源岩的关系[J]. 石油学报, 2016, 37(4): 430-438.

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Nanhua-Sinian rift distribution and its relationship with the development of Lower Cambrian source rocks in the southwest depression of Tarim Basin

塔西南坳陷南华纪-震旦纪裂谷分布及其与下寒武统烃源岩的关系

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