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鄂尔多斯盆地南梁地区长4+5 油层组储层特征
引用本文:徐丽,王轶平,段毅,邢蓝田,吴保祥,张晓丽.鄂尔多斯盆地南梁地区长4+5 油层组储层特征[J].岩性油气藏,2012,24(4):34-39.
作者姓名:徐丽  王轶平  段毅  邢蓝田  吴保祥  张晓丽
作者单位:1.中国科学院油气资源研究重点实验室,甘肃兰州730000; 2.中国科学院研究生院,北京100049; 3.中国石油长庆油田分公司第二采油厂,甘肃庆阳745100
基金项目:国家自然科学基金项目“不同演化阶段煤层气成因及其判识的模拟实验研究”(编号:40872092)资助
摘    要:鄂尔多斯盆地南梁地区延长组长4+5 油层组是该区重要的储集层之一,包括长4+51和长4+52共2个小层。通过储层岩石学、储层物性、孔隙结构及储层控制因素对该区储层特征进行了分析,并评价了储层的储集性能。结果表明:该区砂岩以长石砂岩和少量岩屑质长石砂岩组成;储层孔隙类型以粒间孔和溶 蚀孔为主;喉道以细-微细喉道为主,排驱压力相对较高,属超低渗储集岩。沉积作用和成岩作用是造成 储层超低渗的主要原因。沉积作用控制了砂体的展布;成岩过程中压实与胶结作用使储层孔隙大量减少, 而黏土膜胶结、溶蚀作用和烃类侵位对孔隙建造具有积极作用。根据岩性和物性特征,将该区储集岩划分 为2 类,优质储层的勘探应以沉积作用控制下的多套砂体相互叠置的水下分流河道沉积为重点。

关 键 词:断层  油气成藏  长9  油藏  姬塬油田  

Reservoir characteristics of Chang 4+5 oil reservoir set in Nanliang area,Ordos Basin
XU Li,WANG Yiping,DUAN Yi,XING Lantian,WU Baoxiang,ZHANG Xiaoli.Reservoir characteristics of Chang 4+5 oil reservoir set in Nanliang area,Ordos Basin[J].Northwest Oil & Gas Exploration,2012,24(4):34-39.
Authors:XU Li  WANG Yiping  DUAN Yi  XING Lantian  WU Baoxiang  ZHANG Xiaoli
Affiliation:(1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China; 2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China; 3. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, China
Abstract:The Chang 4+5 oil reservoir set which is composed of Chang 4+52 and Chang 4+51 sublayers in Nanliang area in Ordos Basin is an important oil reservoir.Based on petrological and physical features,this paper studied the characteristics of Chang 4+5 oil reservoir set and evaluated reservoir properties.The result shows that the reservoir sandstone is compose of arkose and lithic arkose;the pore types are mainly intergranular pores and dissolved pores;the main throat type is fine to micro-fine throat and the reservoir displays high displacement pressure.It indicates that Chang 4+5 oil reservoir set belongs to ultra-low permeability reservoir.Sedimentation and diagenesis are the main factors of ultra-low permeability.Sedimentation controlled the distribution of reservoir.Compaction and cementation decreased the primary pores,while chlorite-cementation,dissolution and hydrocarbon emplacement play constructive role of the porosity building.Based on lithology and physical properties,the reservoir rocks can be divided into two types.The favorable reservoir should be in the subsea distributary channel sand bodies controlled by sedimentation.
Keywords:reservoir characteristics  sedimentation  diagenesis  Yanchang Formation  Nanliang area  Ordos Basin
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