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Reservoir Log Evaluation of Xiashihezi Formation in Hangjinqi Area of the Northern Ordos Basin

Author: GuoLan
Tutor: ZhangXiaoLi
School: Northwestern University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Depositional systems Four sexual relationship Log interpretation Gas reservoir identification Reservoir Evaluation Hangjinqi area
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 197
Quote: 0
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Abstract


The region of Hangjinqi is located in the northern part of the Ordos Basin Yimeng uplift and northern Shaanxi slope transition area. Drilling well number in the region less lower degree of exploration and reservoir depth of typical low porosity and low permeability reservoir, combined with the influence of surface conditions, the lack of seismic data, a comprehensive study is relatively weak, and therefore make full use of geological data and logging reservoir evaluation, reservoir evaluation Hangjinqi area an important means of one of the papers on the basis of the results of previous studies, the use of the logging, sedimentology, petroleum geology multidisciplinary phase The combination of research methods, the full collection of gas testing, logging, logging, property analysis testing to carry out the study area Xiashihezi logging reservoir evaluation studies. More scientific and practical research work, a combination of macro and micro combined regional geological data with a single well geological data, geological logging technology combined research methods, the study area Xiashihezi in-depth study of the stratigraphy, depositional systems, and reservoir distribution, grasp the characteristics of the area Xiashihezi sedimentary facies and reservoir development. The deposition system Xiashihezi Hangjinqi area is mainly composed of alluvial fan depositional system, river depositional system, braided delta depositional system. Reservoir sandstone compositional maturity and maturity structure; pore type of primary porosity and secondary porosity, secondary porosity; low porosity and low permeability reservoir, the reservoir pore complex structure. The papers fine study the study area Xiashihezi relationship, thus identifying lithology, calculate the key parameters of the reservoir, synthetic discriminant gas. Studies have shown that the acoustic time curve and spontaneous potential curve overlap, depending on the magnitude difference between the curve, you can quickly and intuitively accurate identification of effective reservoir; sonic - neutron porosity, density after the transformation of the the three porosity curve unified dimensionless - combination of two neutron porosity, overlap, depending on the magnitude difference between the curve, you can quickly identify gas-bearing; reverse overlap acoustic impedance values ??/ acoustic time curve and acoustic time curve, according to the apparent magnitude difference between the curves gas reservoir identification, the effect is significant. Acoustic time and deep lateral resistivity crossplot and the acoustic time and compensated density crossplot can effectively distinguish between dry layer and gas; deep lateral resistivity - natural gamma crossplot, effectively divide the water layer. Established on the basis of the above study, the reservoir parameters (clay content, physical properties, saturation) log interpretation model, accuracy of actual production log interpretation accuracy requirements. Furthermore, Hangjinqi area under Xiashihezi box, box 8, 7-segment box a comprehensive evaluation of the gas accumulation plays in that Box 8, Box 8, Box 7 segment are different degrees of development of natural gas exploration zone.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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