BZ油田沙二段低渗储层定量预测方法

BZ油田沙河街组低渗储层埋藏深、钻井少、地震资料品质差、相带变化快,储层展布特征认识不清,直接制约油田开发调整及滚动挖潜。针对这一难点,在储层特征、地震资料品质分析基础上,结合井震标定、正演模拟分析,探讨了90°相位转换技术在BZ油田沙二段低渗储层预测中的适用性。结果表明,BZ油田沙二段1—4小层砂层组厚度与地震资料分辨最佳厚度匹配较高,90°相位转换地震剖面中地震零相位反射界面与砂层组岩性界面对应关系好,正演波形能够定量刻画砂层组纵向厚度;基于90°相位转换技术,在砂层组厚度定量表征基础上,运用地震沉积学方法和统计学方法,实现了BZ油田沙二段主力含油层段砂体厚度的定量预测,新增调整井实钻储层厚度与钻前预测基本一致。该研究成果有效指导了BZ油田沙二段低渗油藏整体开发方案的部署和实施,也可为类似区块勘探开发提供借鉴。

Quantitative prediction of lowly permeable reservoir in Member Sha 2 in BZ oil field

Duo to deep buring, limited wells, poor seismic data quality and rapid change of sedimentary facies, the lowly permeable reservoir distribution of Shahejie formation in BZ oil field are still unclear and the deployment adjustment and rolling tapping of the oil field potential are restricted. Facing the situation 90 degree phase conversion technology is tried to predict the lowly permeable reservoir in Member Sha 2 based on the analysis of reservoir characteristics, seismic data quality, calibrating downhill seismic records and forward modeling. The result is that the thickness of sub-sandstone layer 1-4 of Member Sha 2 is well matched with the optimal seismic resolved thickness of the sub layers and the zero/phase reflection interfase in 90 degree phase conversion seismic profile is well corresponded with the lithologic interface of the sand layers. The forward wave form can quantitatively describe vertical thickness of the sand layers. Based on 90 degree phase conversion technology and the state thickness quantitative characterization of the sand layers and seismic sediment ology and statistics thickness of the main oil layer is quantitatively predicted. The factual reservoir thickness of the newly adjusted wells is basically consistent with the pre-drilling prediction thus the prediction can effectively guide the overall development and deployment implementation of Member Sha 2 and similar blocks.