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首页> 外文期刊>AAPG Bulletin >Genetic mechanism of high-quality reservoirs in Permian tight fan delta conglomerates at the northwestern margin of the Junggar Basin, northwestern China
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Genetic mechanism of high-quality reservoirs in Permian tight fan delta conglomerates at the northwestern margin of the Junggar Basin, northwestern China

机译：中国西北朱格盆地西北边缘二叠纪紧的粉丝三角洲集团高质量水库的遗传机制

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摘要

Fan delta conglomerate reservoirs in the Permian Jiamuhe Formation in the Zhongguai area at the northwestern margin of the Junggar Basin, northwestern China, are reservoirs for large accumulations of natural tight gas. The tight conglomerates and sandstones are mainly litharenites with a large amount of texturally and compositionally immature volcanic clastic materials. Core porosities demonstrate the development of anomalously high porosities at depths of 3200-4200 m (10,500-13,800 ft) and 4500-4900 m (14,800-16,100 ft). The Permian reservoirs experienced initial rapid subsidence, uplift, and further subsidence, and diagenetic reactions occurred in these reservoirs involving compaction; precipitation of chlorite clays, calcites, zeolites, iron oxides, kaolinite, and quartz cements; and dissolution of unstable minerals including analcite, laumontite, feldspars, and rock fragments. Low-porosity reservoirs, with extensive compaction and (or) cementation of calcite and heulandite-Ca, consist of only few visible secondary pores formed by dissolution of feldspars and rock fragments. Reservoirs with anomalously high porosity, however, experienced relatively weak compaction and contain significant amounts of secondary pores formed by dissolution of mainly laumontites, some feldspars, and rock fragments. Comprehensive studies of sedimentary features and diagenesis of the reservoirs indicate that these anomalously high porosities originate from chronological coupling of four important geological processes. (1) Sedimentary facies and detrital compositions controlled distribution of various zeolites in reservoirs, with abundant laumonites developed in reservoirs in the fan delta front subfacies. (2) Early precipitation of the laumontites inhibited compaction during deep burial; however, they provided unstable minerals for secondary porosity development. (3) The Permian reservoirs experienced subaerial exposure erosion during the uplift stage, and meteoric freshwater leached laumontite cements and aluminosilicate grains to form secondary pores in reservoirs beneath the unconformity. (4) Hydrocarbon emplacement at relative shallow depth during a second subsidence period preserved the secondary pores in reservoirs by retarding late carbonate cementation.
机译：粉丝三角洲集团水库在朱义地区的二叠纪吉米尔山区，在中国西北三格盆地的西北部边缘，是储层，是巨大的天然紧汽油累积。紧密的砾岩和砂岩主要是具有大量纹理和合成的未成熟的火山碎屑材料的鳞片。核心孔隙症展示了大致高孔隙的发展，深度为3200-4200米（10,500-13,800英尺）和4500-4900米（14,800-16,100英尺）。二叠纪水库经历了初步的快速沉降，隆起和进一步的沉降，并且在这些涉及压实的储层中发生了成岩反应;亚氯酸盐粘土，燃烧石，沸石，氧化铁，高岭石和石英水泥沉淀;并溶解不稳定的矿物质，包括anciTE，Laumontite，长石和岩石碎片。低孔隙储层，具有广泛的压实和（或）方解石和海尔安底岩 - CA的胶结，仅由长石和岩石碎片溶出来形成的少数可见的次要孔隙。然而，具有异常高孔隙率的储层相对较弱，含有大量的次要孔，通过溶解主要Laumontites，一些长石和岩石片段。储层沉积特征和成岩作用的综合研究表明，这些异常高孔隙症起源于四个重要地质过程的年代偶联。 （1）沉积相和滴乳组合物控制储层中各种沸石的分布，具有丰富的少年在风扇三角洲前亚群中的储层中开发。 （2）LauNtites的早期沉淀在深埋期间抑制压实;然而，它们为二级孔隙发育提供了不稳定的矿物质。 （3）二叠系储层在提升阶段经历了Superial曝光糜烂，而MeDeoric淡水浸出的Laumontite水泥和硅铝酸盐谷物，以在不整合下的储层中形成次级毛孔。 （4）在第二次沉降期间在相对浅深度的烃施加通过延迟晚期碳酸酯胶结，在储层中保留了蓄水池中的次要孔隙。

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  • 来源
    《AAPG Bulletin》 |2017年第12期|共25页
  • 作者

    Yuan Guanghui; Cao Yingchang; Qiu Longwei; Chen Zhonghong;

  • 作者单位

    China Univ Petr Sch Geosci Geol Dept 66 Changjiang West Rd Qingdao 266580 Peoples R China;

    China Univ Petr Sch Geosci Geol Dept 66 Changjiang West Rd Qingdao 266580 Peoples R China;

    China Univ Petr Sch Geosci Geol Dept 66 Changjiang West Rd Qingdao 266580 Peoples R China;

    China Univ Petr Sch Geosci Resource Dept 66 Changjiang West Rd Qingdao 266580 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气地质与勘探;矿床学;
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