AVO技术在哥伦比亚Llanos盆地D区块油气检测中的应用研究  

Application of the AVO technique in oil and gas detection in block D, Llanos basin,Colombia

作　　者：马永强[1] MA Yongqiang(Sinopec Geophysical Research Institute,Nanjing 211103,China)

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院

出　　处：《石油物探》2019年第4期580-590,共11页Geophysical Prospecting For Petroleum

基　　金：“十三五”国家重大专项“不同缝洞储集体地震识别与预测技术”(2016ZX05014001);中石化科技部项目“碎屑岩储层物性参数反演技术与软件”(P17057-4)共同资助~~

摘　　要：哥伦比亚Llanos盆地D区块砂体较为发育,高产井均表现为亮点地震响应特征.新部署的D1井和D2井地震响应均为亮点,D1井钻遇大套砂岩且高产,D2井无砂岩钻遇且无油气发现,因此迫切需要开展油气检测研究,解决亮点储层含油气问题.针对这一问题,首先利用AVO背景趋势校正处理方法,获得了相对保幅的叠前CRP道集,不仅拓宽了叠前道集大入射角频谱,保留了储层更多含油气信息,而且使地震道集与井旁正演道集背景趋势一致,确保了AVO属性与实钻井结果具有可解释性,为后期AVO属性分析奠定了数据基础;其次开展薄层AVO正演模拟,分析了调谐厚度对AVO属性的影响;最后结合流体替换和正演分析,优选AVO敏感属性P×G进行储层含油气检测.实际资料处理结果表明,该方法预测的含油气性与实钻井结果吻合度高,依据预测结果部署的D3井获得了高产油气.Block D of Llanos basin,Colombia,contains sand bodies.The high-yield wells in this area are all characterized by the presence of bright spots.The recently drilled wells D1 and D2 are both shown as bright spots in seismic profiles.Well D1 crosses large sets of sandstone and is highly productive,whereas no sandstone is encountered and no oil or gas are detected in well D2.This inconsistency prompts an urgent oil and gas detection so that the hydrocarbon bearing characteristics of bright-spot reservoirs can be addressed.First,a pre-stack CRP gather with preservation of relative amplitude was conducted by correcting the AVO background trend.This process not only expands the frequency bandwidth of large incident angle pre-stack gathers,but also preserves more information about hydrocarbon in the reservoir.Furthermore,it makes the background trend of seismic gathers and near-well modeling gathers consistent,and ensures that the AVO attribute without well participation and real drilling data are interpretable,which lays the data foundation for the AVO attribute analysis.Subsequently,a thin-layer AVO forward analysis is performed in order to avoid the influence of tuning thickness on AVO attribute analysis.Finally,in combination with fluid replacement and forward analysis,the AVO sensitive property P×G is optimized for reservoir hydrocarbon.The results of the practical application showed that the predictive results of this method are highly consistent with the actual drilling results,and D3 is drilled on the basis of the model predictions,which confirms the effectiveness of the proposed method for well drilling in the study area.

关 键 词：叠前CRP道集 AVO背景趋势校正 AVO薄层正演 亮点反射 流体替换 油气检测 

分 类 号：P631[天文地球—地质矿产勘探]