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首页> 外文会议>Indonesian Petroleum Association Twenty-Eighth Annual Convention Vol.1, Feb 26-28, 2002, Jakarta >ACOUSTIC IMPEDANCE AS A TOOL TO IDENTIFY RESERVOIR TARGETS: A CASE STUDY OF THE NE BETARA-11 HORIZONTAL WELL, JABUNG BLOCK, SOUTH SUMATRA
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ACOUSTIC IMPEDANCE AS A TOOL TO IDENTIFY RESERVOIR TARGETS: A CASE STUDY OF THE NE BETARA-11 HORIZONTAL WELL, JABUNG BLOCK, SOUTH SUMATRA

机译：声阻抗作为确定储层目标的工具：以南苏门答腊省贾本区块NE BETARA-11水平井为例

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摘要

Application of acoustic impedance generated from 3D seismic data has proven to be an excellent tool to identify reservoir distribution. The NE Betara-11 Horizontal Well, operated by Devon Energy in the Jabung Block, South Sumatra, had been proposed based on interpretation of an acoustic impedance volume. The well successfully penetrated the reservoir target and tested over 2000 barrels oil per day from a 975 feet long horizontal section. The NE Betara field is the largest field in the Jabung Block that contains oil and gas reserves in sandstones of the Lower Talang Akar Formation. The Lower Talang Akar Formation provides high quality reservoir sands with up to 26% porosity and 1 Darcy permeability. The distribution of this high quality sandstone, which was deposited in a fluvial to estuarine environment, is very difficult to predict. The eleven wells drilled in this field would suggest that reservoir distribution varies drastically across the field. Pressure data and CO_2 distribution suggest that the field be made up of multiple compartments with different fluid contacts. This presents a major challenge to predict reservoir distribution and fluid content, and to recommend optimal drilling targets and well plans. A cross-plot of lithology versus acoustic impedance from well log data revealed a strong correlation of sandstone to low impedance and shale to high impedance. The acoustic impedance volume also showed an excellent tie to the well logs. These relationships allowed identification of the reservoir target and optimal wellbore design. The NE Betara-11 well targeted a thick channel sand that is gas-bearing at an up dip position in the NE Betara-7 well and was predicted to be oil-bearing at the proposed location. The NE Betara-11 successfully penetrated the target sand and encountered the predicted oil column throughout the drilling of a 975 feet horizontal section. As a result of this well, the utilization of acoustic impedance has proven to be an effective tool for identifying reservoir targets and planning well trajectories in the NE Betara field.
机译：从3D地震数据生成的声阻抗的应用已被证明是识别储层分布的绝佳工具。德文能源公司在南苏门答腊省Jabung区块运营的NE Betara-11水平井是根据声阻抗体积的解释提出的。该井成功穿透了储层目标，每天从975英尺长的水平剖面测试了2000桶石油。 NE Betara油田是Jabung区块中最大的油田，其中包含塔朗下阿卡岩层下部砂岩中的石油和天然气储量。下塔朗阿卡岩层提供了高质量的储层砂，孔隙率高达26％，渗透率达1。这种高质量砂岩的分布非常难以预测，而这种砂岩沉积在河流环境的河床中。在该油田中钻探的11口井表明，整个油田的储层分布都发生了巨大变化。压力数据和CO_2分布表明，该场由具有不同流体接触的多个隔室组成。这对预测储层分布和流体含量以及推荐最佳钻井目标和井计划提出了重大挑战。根据测井数据得到的岩性与声阻抗的交叉图显示，砂岩与低阻抗，页岩与高阻抗有很强的相关性。声阻抗体积也显示出与测井曲线的良好联系。这些关系允许确定储层目标和最佳井眼设计。 NE Betara-11井的目标是厚通道砂，该砂在NE Betara-7井的上倾位置处含气，预计在建议的位置含油。 NE Betara-11在975英尺水平段的整个钻探过程中成功地穿透了目标砂并遇到了预测的油柱。由于有了这口井，已证明利用声阻抗是确定NE Betara油田储层目标和规划井眼轨迹的有效工具。

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