四川盆地元坝地区下侏罗统介壳灰岩储层分布预测

发布时间：2018-06-23 18:11

本文选题：四川盆地 + 元坝地区　；参考：《现代地质》2017年01期

【摘要】：四川盆地下侏罗统自流井组大安寨段一亚段(大一亚段)灰岩是元坝地区主要产气层。岩心、薄片、物性资料、试油、录井、测井、地震资料综合研究表明,大一亚段灰岩主要为介壳灰岩和含泥介壳灰岩,介壳灰岩平均孔隙度2.36%,平均渗透率为0.02×10~(-3)μm~2,含泥介壳灰岩平均孔隙度为4.59%,平均渗透率为0.21×10~(-3)μm~2。介壳灰岩为浅湖亚相高能滩微相沉积,含泥介壳灰岩为浅湖亚相次高能滩微相沉积。地震波形分类上,以介壳灰岩为主的高能滩微相为高连续低频中强波谷反射,以含泥介壳灰岩为主的次高能滩微相为高连续低频中弱振幅波谷反射。高连续低频中强振幅波谷反射和高连续低频中弱振幅波谷反射以SW-NE向分布于研究区中央地带。以伽马值大于46 API为门槛值剔除泥岩、泥质粉砂岩等,得到介壳灰岩和含泥介壳灰岩的伽马数据体。精细刻画了高能滩微相介壳灰岩和次高能滩微相含泥介壳灰岩的分布范围,新增天然气有利区面积518 km~2,为元坝地区大安寨段天然气储量和产量的增加奠定了坚实的基础。
[Abstract]:The limestone of the first member of the Da'anzhai member of the Lower Jurassic Ziliujing formation in Sichuan Basin is the main gas producing zone in Yuanba area. The comprehensive study of core, thin slice, physical property data, oil test, logging, logging and seismic data shows that the limestone of the first member is mainly composed of meso-shell limestone and mud-bearing meso-shell limestone. The average porosity is 2.36, the average permeability is 0.02 脳 10 ~ (-3) 渭 m ~ (-2), the average porosity is 4.59 and the average permeability is 0.21 脳 10 ~ (-3) 渭 m ~ (-2). The mesoclase limestone is a shallow lacustrine subfacies high-energy beach microfacies deposit, while the mud-bearing shell limestone is a shallow lacustrine subfacies sub-high-energy beach microfacies deposit. In the classification of seismic waveforms, the high-energy beach microfacies mainly composed of meso-shell limestone is high continuous low-frequency medium-strong wave valley reflection, and the secondary high-energy beach microfacies dominated by mud-bearing meso-shell limestone is high continuous low-frequency medium-weak amplitude wave trough reflection. High continuous low frequency medium and strong amplitude trough reflection and high continuous low frequency medium and weak amplitude trough reflection are distributed in SW-NE direction in the central area of the study area. Taking gamma value greater than 46 API as the threshold value to exclude mudstone, argillaceous siltstone and so on, the gamma-ray data bodies of meso-shell limestone and mud-bearing meso-shell limestone are obtained. The distribution range of high-energy beach microfacies meso-limestone and sub-high-energy beach microfacies mud-bearing shell limestone is described in detail, and the area of natural gas favorable zone is 518 km2, which lays a solid foundation for the increase of natural gas reserves and production in Da'anzhai section of Yuanba area.
【作者单位】：中国石化勘探分公司;
【基金】：国家科技重大专项“碎屑岩层系大中型油气田富集规律与勘探关键技术”(2011ZX05002-004)
【分类号】：P618.13;P534.52

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