摘要
蓬莱9-1油田的潜山为中生界花岗岩,经钻井揭示该油田潜山具有埋深浅、风化作用强、裂缝储层横向变化快的特点。通过精细岩石物理研究,密度在该油田潜山段能够较好地识别裂缝储层,但是由于潜山段井间密度基线差异较大,对利用密度进行井间裂缝储层预测提出了挑战。笔者采用基线差密度校正法对井间密度基线进行了一致性处理,并通过构建正演模型分析了密度变化对AVO响应特征的影响,最终利用叠前同时反演技术得到基线差校正后的密度体,解决了密度基线的差异性对裂缝储层预测的影响;还结合裂缝储层的基线差校正后的密度与总孔隙度之间良好的规律关系,利用基线差校正后的密度体在较好地描述潜山段裂缝储层展布规律的基础上,进一步刻画了井间裂缝储层的孔隙度发育程度,并得到了验证井的验证。该技术在蓬莱9-1油田潜山裂缝储层预测的成功应用,为今后类似潜山裂缝储层研究提供了借鉴意义。
The buried hill of the PL9？1 oilfield is a Mesozoic granite buried hill,which is characterized by shallow buried depth,strong weathering degree and great lateral variation of fractured reservoirs.On the basis of fine rock physical analysis,the density can better recognize the fractured reservoirs in the buried hill of this oilfield.Nevertheless,in this buried hill,the density baselines between wells show differences,which leads to different density measurements in describing the reservoirs. This is a challenge to predicting fractured reservoirs between wells.This study successfully solved the problem of density baseline differences between wells by using the method of density baseline differential correction,combined with verifying the feasibility of pre？stack inversion by the forward model analysis of AVO.The corrected density volume was achieved by pre？stack inversion.Furthermore,taking advantage of the good relationship between the corrected density and total porosity of the fractured reservoirs,the authors used the corrected density volume to describe the distribu？tion of fractured reservoirs in the buried hill and further reflect the development degree of fractured reservoir porosity horizontally. The result was proved by actual drilled wells. The successful application of this technology will provide important reference for the similar fractured reservoir studies of buried hill in future.
出处
《物探与化探》
CAS
CSCD
2015年第5期1020-1026,共7页
Geophysical and Geochemical Exploration
基金
国家科技重大专项(2011ZX05023-002)
关键词
密度基线校正
叠前反演
裂缝储层
潜山
储层预测
density baseline correction
pre-stack inversion
fractured reservoir
buried hill
reservoir prediction
