埕岛地区埕北20潜山带裂缝类型、发育期次及控制因素  

Fracture types,development phases and controlling factors of Chengbei 20 buried hills in Chengdao area

作　　者：杨少春 齐陆宁[1,2] 李拴豹 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中国石化胜利油田分公司海洋采油厂,山东东营257237 [3]中国海洋石油天津分公司 [4]渤海油田勘探开发研究院,天津300452

出　　处：《中国石油大学学报（自然科学版）》2012年第5期1-6,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油化工股份有限公司攻关项目(So-PF0769D010E);国家科技重大油气专项课题(2011ZX05009-003)

摘　　要：依据岩心观察和薄片分析并应用潜山测井解释模型,揭示埕岛地区埕北20潜山带的裂缝类型及测井响应特征;通过应用碳氧同位素特征判定方法对其裂缝的发育期次进行划分,并依据区域岩性、构造应力场及断层活动分析,对潜山裂缝的发育控制因素进行剖析。结果表明:埕北20潜山带主要发育风化破裂缝和构造破裂缝两种类型;风化破裂缝为网状缝,以高角度为主,分布于不整合面下脆性地层中,构造破裂缝多为斜交缝,形成于拉张和挤压双重构造环境中;两种裂缝在测井响应上均表现出扩径、声波时差增大、低电阻率的特征;裂缝发育主要经历了3个期次,以印支期发育为主,形成了加里东—海西期风化缝、印支期构造缝和燕山期—喜山期拉张缝;裂缝形成受上覆岩性、构造应力场、断层活动等多种因素控制,一般发育在灰岩、白云岩等脆性岩石中,且在无上覆石炭-二叠系砂泥地层覆盖区,或构造应力高值区、断裂带集中发育区。Based on the core observation, thin section analysis and the buried hill log interpretation, the fracture types and the log response features were revealed in Chengbei 20 buried hills. The fracture development phases were distinguished clearly by carbon and oxygen isotope characteristics decision method. Accordingto the regional lithology, tectonic stress field and fault activity analysis, the buried hill fracture controlling factors were explained. The results show that two kinds of frac- tures are identified in Chengbei 20 buried hills, which are weathering fractures and structural fractures. The weathering frac- tures are mesh ones with high density, high angles, and various depths, and distribute in the brittle strata under the uncon- formities. The structural fractures have bevel angles, high tension joint angles and low extrusion joint angles, which are caused by the extensional and compression movements. Both the weathering and the structural fractures perform expanding di- ameter, long interval transit time, and low resistivity characteristics in logging response. The fractures in Chengbei 20 buried hills can be divided into three development phases and Indo-Chinese movement dominates. As a result the Caledonian-Her- cynian weathering fractures, Indo-Chinese structural fractures, and Yanshan-Himalayan tensional fractures form. The forma- tion of the fractures in Chengbei 20 buried hills is mainly controlled by the overlying lithology, the tectonic stress field and the fault activities. The fractures are mainly caused in the brittle rocks such as the limestone and dolomite, especially in those no Carboniferous-Permian sandstone or mudstone overlying. The fractures are also influenced by the tectonic stress andmostly form in the strong tectonic stress field as a consequence. Furthermore, the fractures are controlled by the fauhs, and the fault concentrated development zone is the fracture area as well.

关 键 词：潜山 裂缝类型 发育期次 控制因素 

分 类 号：P583[天文地球—岩石学]