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首页» 过刊浏览» 2020» Vol.5» Issue(4) 441-448     DOI : 10.3969/j.issn.2096-1693.2020.04.038
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川东北须家河组致密砂岩断缝系统 I:断层破碎带的平面分布特征
廖宗湖,陈伟伦 ,李薇,刘辉 ,邹华耀,郝芳
1 中国石油大学(北京)地球科学学院,北京 102249 2 中国石油大学(华东)地球科学与技术学院,青岛 266580
Fault-fracture systems of the Xujiahe tight sandstone in the Northeast Sichuan Basin, Part I: Distribution of fault damage zones
LIAO Zonghu, CHEN Weilun , LI Wei , LIU Hui , ZOU Huayao , HAO Fang
1 College of Geoscience, China University of Petroleum-Beijing, Beijing 102249, China 2 School of Geosciences, China University of Petroleum-Huadong, Tsingdao 266580, China

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摘要  断层破碎带通常伴生有复杂的裂缝系统,为地下流体渗流提供了重要通道,影响着油气、矿产、地下水 等的储存。迄今为止,地下断层破碎带特征的研究因缺乏数据而相对较少。依托三维地震勘探资料,本文提取 了振幅剖面、极大和极小曲率属性、方差等地震属对通南巴马路背地区须家河组致密砂岩断层破碎带的平面分 布特征进行研究。 结果显示通南巴背斜在不同时期受到来自不同方向不同强度应力的综合作用,形成现今的北 东向的背斜主体,并叠加有一系列北西向的次生褶皱和断层破碎带。工区范围内主要有 6 条NNW向逆断层破碎 带,包括 3 条延伸超过 10 km的长断层破碎带,和 3 条延伸 3~6 km的较短断层破碎。这些断层破碎带在走向上 宽度差异明显,破碎范围在 270~1250 m,是该地区的断缝系统主要组成部分。高产井Ma101 和Ma201 处于F2、 F3 断层破碎带之间的构造高部位,断缝成藏优势明显。其中F2 断层为通源断裂,可以沟通下部海相气源;而 其他区域虽也有处于断块两背斜之间的区域,但处于构造低部位,并且离大断层较远,断缝成藏优势较不明显。 本文为地下断层破碎带平面分布特征的描述提供了地震多属性分析方法,对建立致密砂岩地下断缝系统和相应 的油气富集成藏模式有重要作用。
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关键词 : 四川盆地;致密砂岩;断缝系统;断层破碎带;地震属性
Abstract

Fault damage zones are often associated with complex fracture systems that provide important pathways for subsurface fluid migration, affecting oil and gas reservoirs, mineral deposits, groundwater, etc. To date, subsurface fault characterization has been relatively limited due to lack of data. The purpose of this paper is to characterize the planar distribution of the damage zones of the reverse fault systems on top of the Xujiahe tight sandstone in the Malubei area of Tongnan by using three-dimensional seismic attributes. The seismic attributes include, maximum and minimum curvature attributes, seismic variance, and comple mentary amplitude profiles. 

The results show that the Tongnanba anticline was subjected to the superimposed effects of several tectonic movements, forming the present-day north-east anticline with a series of secondary north-west folds and fault fragmentation zones. Six NNW-trending fault damage zones were identified in the study area. There are three fault damage zones with lengths >10 km, and three shorter ones with lengths of 3~6 km. Each of the damage zones has a different width of between 270~1250 m, as an important part of the fault-fracture system in the area. The analysis indicates that both Ma101 and Ma201 are in the structural-high parts surrounded by the large faults (F3, F6), with the advantage of a fracture network. The fault F2 may be a source-reservoir pathway and in communication with the lower marine phase, while the other regions lack accumulation potential as they are located far away from faults and in a lower part of the structure. This paper provides a new approach to the identification and depiction of geometrical patterns of subsurface fault damage zones through the analysis of multiple seismic attributes, which is important to the delineation of the subsurface fault-fracture systems and the corresponding accumulation models of natural gas in the Sichuan Basin.


Key words: Sichuan Basin; tight sandstone; fault-fracture system; fault damage zone; seismic attributes
收稿日期: 2020-12-29     
PACS:    
基金资助:中国科学院A 类战略性先导科技专项“智能导钻”(XDA14010306) 资助
通讯作者: zonghuliao@163.com
引用本文:   
LIAO Zonghu, CHEN Weilun, LI Wei, LIU Hui, ZOU Huayao, HAO Fang. Fault-fracture systems of the Xujiahe tight sandstone in the Northeast Sichuan Basin, Part I: Distribution of fault damage zones. Petroleum Science Bulletin, 2020, 04: 441-448.
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