川东北达川-万县地区下三叠统飞仙关组层序地层研究

doi:10.3969/j.issn.1673-8926.2017.04.004

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 30–37.doi: 10.3969/j.issn.1673-8926.2017.04.004

川东北达川-万县地区下三叠统飞仙关组层序地层研究

孙春燕^1,2,3, 胡明毅^1,2,3, 胡忠贵^1,2,3

1. 长江大学沉积盆地研究中心, 武汉 430100;
2. 长江大学油气资源与勘探技术教育部重点实验室, 武汉 430100;
3. 长江大学地球科学学院, 武汉 430100

收稿日期:2016-11-06 修回日期:2017-02-15 出版日期:2017-07-21 发布日期:2017-07-21
第一作者:孙春燕(1989-),女,长江大学在读博士研究生,研究方向为沉积学和层序地层学。地址:(430100)湖北省武汉市蔡甸区大学路特1号长江大学武汉校区。Email:1045286355@qq.com
通信作者: 胡明毅(1965-),男,博士,教授,博士生导师,主要从事沉积学和层序地层学方面的研究与教学工作。Email:humingyi65@163.com
基金资助:
国家重大科技专项“中国大型气田形成条件、富集规律及目标评价”（编号：2016ZX05007-002）和国家自然科学基金面上项目“碳酸盐岩台缘礁滩储层精细地质建模研究”（编号：41372136）联合资助

Characteristics of sequence stratigraphy of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area,northeastern Sichuan Basin

SUN Chunyan^1,2,3, HU Mingyi^1,2,3, HU Zhonggui^1,2,3

1. Research Center of Sedimentary Basin, Yangtze University, Wuhan 430100, China;
2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
3. School of Geosciences, Yangtze University, Wuhan 430100, China

Received:2016-11-06 Revised:2017-02-15 Online:2017-07-21 Published:2017-07-21

摘要/Abstract

摘要： 为了厘清达川—万县地区下三叠统飞仙关组鲕滩储层和白云岩储层的发育、演化及纵向分布规律，基于Vail层序地层学理论，以沉积暴露面、岩性突变面和不整合面等多种层序界面标志为依据，对典型单井进行层序划分，再结合相对海平面的升降变化，将飞仙关组划分为2个三级层序（Sq1和Sq2）及4个体系域（Sq1海侵体系域、Sq1高位体系域、Sq2海侵体系域和Sq2高位体系域），进而通过跨相区连井层序地层剖面的对比，建立了该区层序地层格架。研究表明，各体系域在区域上可对比性较强，高位体系域后期发育台地边缘鲕滩相和台地内鲕滩相沉积，且均发生了强烈的白云岩化作用，改善了岩石孔渗性；在深埋藏条件下，白云岩原生孔隙易于保存，具有一定抗压实、压溶性，为深层优质储层的形成奠定了基础。研究结果可为该区下一步天然气勘探开发提供一定地质依据。

关键词: 天文地层学, 旋回地层学, 轨道参数, 气候替代性指标, （亚）米兰科维奇周期, 页岩气

Abstract: In order to clarify the development, evolution and distribution of oolitic beach reservoir and dolomite reservoir of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area, based on the theory of Vail sequence stratigraphy, combined with sequence boundary markers, such as the exposed surface, lithological mutation and sequence unconformity surface, the sequence of the typical single well was divided. According to the change of relative sea level rising and falling, the Feixianguan Formation can be divided into two third-order sequences(Sq1 and Sq2)and four system tracts. Sq1 consists of the first and second members of Feixianguan For-mation, and Sq2 consists of the third and fourth members of Feixianguan Formation. Both Sq1 and Sq2 are made up of transgressive and highstand systems tracts, lacking of the lowstand systems tract. The sequence stratigraphic framework of this area was established by comparing the sequence stratigraphic sections of the cross facies zone. The results show that each systems tract in the region can be comparative, platform margin oolitic facies and intraplatform oolitic facies developed in the late period of highstand systems tract, and the strong dolomitization improved the porosity and permeability. Under the condition of deep burial, the primary pore of dolomite is easy to be preserved, and it has a certain anti-compaction and anti-pressure solution, which lays a foundation for the formation of high quality reservoir. The result has important geological significance for further exploration in Sichuan Basin.

Key words: astrostratigraphy, cyclostratigraphy, orbit parameters, climate substitute index, (sub)Milankovitch cycle, shale gas

中图分类号:

TE121.3+4

孙春燕, 胡明毅, 胡忠贵. 川东北达川-万县地区下三叠统飞仙关组层序地层研究[J]. 岩性油气藏, 2017, 29(4): 30–37.

SUN Chunyan, HU Mingyi, HU Zhonggui. Characteristics of sequence stratigraphy of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area,northeastern Sichuan Basin[J]. Lithologic Reservoirs, 2017, 29(4): 30–37.

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川东北达川-万县地区下三叠统飞仙关组层序地层研究

Characteristics of sequence stratigraphy of the Lower Triassic Feixianguan Formation in Dachuan-Wanxian area,northeastern Sichuan Basin

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