北部湾盆地涠西南凹陷断块圈闭断层封堵性规律——基于区域大数据分析  

Regional Big Data Used to Analyze the Sealing Toxicity of Fault Blocks in Weixinan Sag,Beibuwan Basin

作　　者：董德喜 肖大志 姚意迅 郇金来 严恒 DONG De-xi;XIAO Da-zhi;YAO Yi-xun;HUAN Jin-lai;YAN Heng(CNOOC China Limited,Hainan Branch,Haikou 570312,China;CNOOC China Limited,Zhanjiang Branch,Zhanjiang 524057,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《河北地质大学学报》2023年第3期39-47,共9页Journal of Hebei Geo University

摘　　要：为了明确北部湾盆地涠西南凹陷主力含油层渐新统涠三段断层封堵性主控因素,采用先分类、再总结的研究思路,类比分析优选评价参数,并引入新的评价参数,对断层封堵性进行分析研究。同时,在研究区采用更加先进的断层封堵性分析平台,使得各封堵性评价参数的建模更加符合地质实际,可以更精确的表征不同位置处各参数的差异,并可以实现三维可视化。最终,获得数千个断层封堵性评价参数值,通过区域大数据分析得到了适合不同构造带的断层封堵性评价参数及参数的界限值,结果表明:二号断裂带、洼中隆构造带的断层封堵性主控因素主要为断面正压力,当断面正压力P>25 MPa时,断层是封堵的,为油层;涠西南低凸起断层封堵性主控因素为岩性对接,当砂泥对接,77%可封堵油气,即为封堵层。在以上研究基础上,建立了二号断裂带、洼中隆构造带、涠西南低凸起断块圈闭封堵性图版,进而为新油气田开发生产方案编制及老油气田挖潜调整等提供了重要依据与类比指标。In order to clarify the main controlling factors and rules of fault sealing property in the third member of fault in the main oil-bearing layer of Weixinan Sag,the research idea of classification and summary was innovatively adopted,and the evaluation parameters were optimized by analogy analysis,and new evaluation parameters were introduced to study the rules of fault sealing property.At the same time,the more advanced fault plugging analysis platform is adopted for the first time in the research area,which makes the modeling of each plugging evaluation parameter more consistent with the geological reality,can more accurately represent the difference of each parameter at different locations,and can realize three-dimensional visualization.Finally,thousands of fault sealing evaluation parameter values were obtained,and through regional big data analysis,suitable fault sealing evaluation parameters and parameter boundary values for different structural zones were obtained.The results showed that the main controlling factor for fault sealing in the No.2 fault zone and the Wazhonglong structural zone was the normal pressure of the fault section.When the normal pressure of the fault section P>25 MPa,the fault is sealed and is an oil layer;the main controlling factor for the sealing ability of the low uplift fault in Weixinan is the lithology connection.When the sand and mud are connected,77%of the oil and gas can be sealed,which is the sealing layer.On the basis of the above research,the No.2 Fault Zone,Wazhonglong structural belt,and weixinan low uplift fault block trap sealing chart have been established,providing important basis and analogy indicators for the preparation of new oil and gas field development and production plans,as well as the adjustment of old oil and gas field potential.

关 键 词：涠西南凹陷 复杂断块油藏 断层封堵性 规律研究 

分 类 号：TE122[石油与天然气工程—油气勘探]