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首页> 外文期刊>Open Journal of Geology >Petrophysical Analysis of Reservoirs Rocks at Mchungwa Well in Block 7 Offshore, Tanzania: Geological Implication on the Reservoir Quality
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Petrophysical Analysis of Reservoirs Rocks at Mchungwa Well in Block 7 Offshore, Tanzania: Geological Implication on the Reservoir Quality

机译：坦桑尼亚近海7区Mchungwa井储层岩石的岩石物理分析：对储层质量的地质意义

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摘要

The present work highlights the results of the study conducted to estimate the petrophyiscal properties of the Mchungwa well with the aim of assessing the quality of reservoirs rocks. A set of well logs data from Mchungwa well were used for the analysis that involved identification of lithology, hydrocarbon and non-hydrocarbon zones and determinations of petrophysical parameters such as shale volume, porosity, permeability, fluid saturation and net pay thickness. This study was able to mark six sandstone zones with their tops and bases. Of the six zones hydrocarbon indication was observed on four zones from which estimation of petrophysical parameters was done to assess the reservoirs quality. The petrophysical parameters across the four reservoirs yield an average shale volume ranging from 0.08 to 0.15 v/v. The porosity ranges from 7% to 23%, indicating a fair to good porosity sandstone, while permeability ranges from 0.01 to 6 mD. The porosity and permeability results suggest that the quality of the sandstone reservoirs identified at Mchungwa well is poor. Fluid types defined in the reservoirs on the basis of neutron-density log signatures and resistivity indicate a mixture of water and gas. However, high water saturation (50% - 100%) indicates that the proportion of void spaces occupied by water is high, thus, indicating low hydrocarbon saturation of 2.4%, 17.9%, 19.2% and 39.3%. Generally the results show that hydrocarbon potentiality at Mchungwa well is extremely low because of small net pay thickness and very low hydrocarbon saturation. This could be attributed to the geology of the surrounding area where low hydrocarbon saturation suggest the presence of non-commercial volumes of either migrant gas or gas generated from the interbedded claystone sediments, which are dominant in the observed well.
机译：本工作重点介绍了为评估Mchungwa井的岩石物理性质而进行的研究结果，目的是评估储层岩石的质量。一组Mchungwa井的测井数据用于分析，包括岩性，烃和非烃带的识别以及诸如页岩体积，孔隙率，渗透率，流体饱和度和净产层厚度等岩石物理参数的确定。这项研究能够标记出六个砂岩带的顶部和底部。在这六个区域中，在四个区域上观察到了烃指示，据此对岩石物理参数进行了评估以评估储层质量。横跨四个储层的岩石物理参数产生的平均页岩体积范围为0.08至0.15 v / v。孔隙率范围为7％至23％，表明砂岩孔隙度为中等至良好，而渗透率范围为0.01至6 mD。孔隙度和渗透率结果表明，Mchungwa井发现的砂岩储层质量较差。根据中子密度测井特征和电阻率在储层中定义的流体类型表示水和天然气的混合物。然而，高的水饱和度（50％-100％）表示被水占据的空隙空间比例高，因此，表明低的烃饱和度分别为2.4％，17.9％，19.2％和39.3％。通常，结果表明，由于净产层厚度小和烃饱和度非常低，Mchungwa井的烃势极低。这可能归因于周围地区的地质情况，在该地区，低烃饱和度表明存在非商业体积的运气或由夹层粘土岩沉积物产生的气体，这在观测井中占主导地位。

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