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库车坳陷侏罗系致密砂岩气藏“三品质”测井评价
信毅, 王贵文, 刘秉昌, 王冰, 艾勇, 蔡德洋, 曹军涛, 赵新建
PDF(9528 KB)
PDF(9528 KB)
库车坳陷侏罗系致密砂岩气藏“三品质”测井评价
Well Logging Evaluation of “Three Quality” of Jurassic Tight Gas Sandstone Reservoirs in Kuqa Depression
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为了阐明库车坳陷侏罗系致密砂岩气藏特征并建立配套的测井评价方法，利用岩心观察、岩石物理实验、常规测井和成像测井等资料，对阿合组致密砂岩气藏“七性关系”（岩性、物性、电性、含油气性、脆性、烃源岩特性和地应力各向异性特征）进行了研究.建立了孔隙度、渗透率、饱和度等测井解释模型及TOC、脆性指数、三轴地应力剖面的测井评价模型.在致密气藏“七性关系”测井表征基础上，提出了储层品质、烃源岩品质和工程品质（三品质）分类标准与对应测井评价体系.结果表明阿合组岩性主要包括砂砾岩、中粗砂岩和泥岩，储集空间主要为粒内溶孔、粒间溶孔、微裂缝以及微孔隙，典型含气层段表现为低伽马（<60 API）、高电阻（>10 Ω·m）、高声波时差（>70 μs/ft）的特征.根据测井计算TOC刻画烃源岩品质，根据物性测试、压汞测试和裂缝发育程度，划分出4种储层品质类型，工程品质则主要通过脆性指数和地应力大小来识别与划分.最终将烃源岩品质、储层品质和工程品质测井评价结果应用到单井产能的评价与预测，与实际试油情况吻合较好，DB101等7口井8个层段中均得到验证.
In order to unravel the tight gas reservoir characteristics and establish the well log evaluation methods of Jurassic tight gas reservoirs in Kuqa depression, core observation, rock physics experiment, conventional logging and image log data were used to unravel the “seven relations” of lithology, physical property, electrical property, oil-gas bearing property, brittleness, source rock properties and in-situ stress of Jurassic Ahe Formation tight sandstone gas reservoir in monocline zone of northern Kuqa depression. The logging interpretation model of porosity, permeability and gas saturation was established, and well logging calculation model of TOC (total organic carbon), brittleness index as well as triaxial in-situ stress profile were established respectively. Then the logging methods of source rock property, reservoir quality and engineering quality are established based on the research of “seven relations”. The results show that the lithology of Ahe Formation mainly includes conglomerate, medium-coarse sandstone and mudstone. The reservoir spaces are mainly intergranular dissolution pore, intragranular dissolution pore, micro-fractures and micro-pores. The typical gas-bearing interval is characterized by low gamma ray (<60 API), high resistance (>10 Ω·m) and high acoustic time difference (>70 μs/ft). The source rock quality was characterized by TOC content calculated by logging, and four reservoir quality types were classified according to physical property test, mercury injection test and the degree of fracture development. The engineering quality was identified and classified mainly by brittleness index and in-situ stress. Finally, the logging evaluation results of “three qualities” were applied to the evaluation and prediction of single well productivity, which is in good agreement with the actual well test, and the results were testified in the eight intervals of seven wells including DB 101 and other wells.
致密砂岩气 / 测井评价 / 甜点优选 / 阿合组 / 库车坳陷 / 石油地质.
tight sandstone gas / well logging evaluation / sweet spot optimization / Ahe Formation / Kuqa depression / petroleum geology
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