复杂断块油气藏低阻油气层成因及发育控制因素——以Muglad盆地Fula凹陷Jake South油田为例  

Genesis and development control factors of low resistivity pays in complex fault block——A case study of Jake South Oilfield in Fula sag of Muglad Basin,Sudan

作　　者：韩如冰[1] 田昌炳[1] 李顺明[1] 洪英霖 蒋义伟 何辉[1] 杜宜静[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田分公司,新疆库尔勒841000 [3]中国石油浙江油田分公司,浙江杭州310023

出　　处：《油气地质与采收率》2017年第2期1-7,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"复杂油气藏精细表征与剩余油分布预测"(2011ZX05009-003)

摘　　要：Muglad盆地Fula凹陷Jake South油田的Ben1油藏和AG1油气藏均为复杂断块油气藏,分别属于复杂断块构造背景下的整装背斜油藏和层状油气藏,发育大量低阻油气层,对油、水层识别造成较大困难。为此,综合岩心、测试、测井等资料,对Jake South油田发育的复杂断块油气藏的低阻油气层成因及发育控制因素进行研究。首先,根据储层的粒度、物性、空间类型、致密程度等对研究区Ben1和AG1段分别进行储层分类,并对其中发育的低阻油气层进行定义;然后,综合利用岩心、薄片、物性、扫描电镜、X衍射等资料,明确研究区复杂断块油气藏各类型储层低阻油气层的成因;最后,对比低阻油气层与储层的分布特征,分析低阻油气层的发育控制因素。研究结果表明,低阻油气层的成因主要为高束缚水饱和度、发育导电矿物以及油气充注不足,而粘土矿物附加导电及工程因素对低阻油气层发育的影响则较小。不同复杂断块油气藏发育的不同类型储层的低阻油气层的成因存在差异,一般仅有1或2种因素起主要作用。低阻油气层的发育受沉积微相类型、储层类型以及低阻油带等因素控制。研究区下步低阻油气层的勘探开发应主要针对Ben1油藏和AG1油气藏发育的优质储层。Ben1 oil reservoir and AG1 oil reservoir of Jake South Oilfield in Fula sag of Muglad Basin are typical complex fault-block oil reservoirs,which are anticline oil reservoir and layered oil reservoir developed in the complex fault block respectively. A number of low resistivity pays were found in Ben1 oil reservoir and AG1 oil reservoir,which added to the difficulty of net pay identification. So the data,such as core data,test data and logging data,were comprehensively used to study the genesis and control factors of low resistivity pays. First,the reservoirs in Ben1 oil reservoir and AG1 oil reservoir were categorized according to their grain size,petrophysical properties,pore type and tightness,and low resistivity pays were defined in each type of reservoir. Then cores,thin sections,petrophysical data,SEM and X-ray diffraction data were comprehensively used to study the genesis of the low resistivity pays. Finally,the relationship between the identified low resistivity pays and the reservoir characteristics was studied to seek the controlling factors of its distribution. The results show that the main genesis of the low resistivity pays were high bound water saturation,low oil saturation caused by insufficienthydrocarbon charging and existence of conductive minerals,while additional conductivity of clay minerals and other engineering causes have little effects. The genesis of low resistivity pays found in different reservoir types and in different complex fault block types were different. The distribution of low resistivity pays was controlled by sedimentary microfacies,reservoir types and low resistivity pay belts,generally by one or two factors. The next exploration and development of the low resistivity oil layer in the study area should be mainly aimed at the high-quality reservoir in Ben1 oil reservoir and AG1 oil reservoir.

关 键 词：复杂断块油气藏 低阻油气层 成因 发育控制因素 Jake South油田 

分 类 号：TE112.3[石油与天然气工程—油气勘探]