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首页> 外文期刊>Arabian journal of geosciences >Authigenic minerals and diagenetic evolution in altered volcanic materials and their impacts on hydrocarbon reservoirs: evidence from the lower Permian in the northwestern margin of Junggar Basin, China
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Authigenic minerals and diagenetic evolution in altered volcanic materials and their impacts on hydrocarbon reservoirs: evidence from the lower Permian in the northwestern margin of Junggar Basin, China

机译：改变后的火山岩中的自生矿物和成岩演化及其对油气藏的影响：来自准Jung尔盆地西北缘下二叠统的证据

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摘要

Potentially, volcanic and volcaniclastic rocks are significant hydrocarbon reservoir rocks. In these rocks, the low-temperature alteration (<200 degrees C) and diagenetic transformation of volcanic materials are universal and usually improve the reservoir quality greatly. Based on observations of available cores, thin sections and scanning electron microscope (SEM) data, this paper describes the complex set of diagenetic reactions in the volcanic material-bearing hydrocarbon reservoirs and their role in creating secondary porosity, as well as providing a scientific geological foundation for quality evaluation and prediction in similar reservoir rocks. Volcanic materials in volcanic and volcaniclastic rocks of the lower Permian in the northwestern margin of the Junggar Basin underwent devitrification, chloritisation, zeolitisation, albitisation and calcification. The analysis of porosity data based on cores indicates that in an open hydrologic system, grain-coating chlorites and the dissolution of minerals can contribute to good porosity, especially in tuff-bearing clastic rocks. Appreciable primary pores are preserved by the formation of early chlorite coats and pore linings. Acidic water dissolved zeolite, albite and calcite that precipitated under alkaline conditions in sedimentary facies and eruptive facies, creating dissolution pores. The nonisopyknic transformation of albitisation created abundant secondary pores in both eruptive facies and effusive facies. Too much cement of chlorite and heulandite (>4 % vol) damaged the reservoir quality. The dissolution of laumontite was significant for deep reservoir quality. Coarse conglomerate with soluble analcime cements developed many secondary dissolution pores and were the most favourable clastic reservoir.
机译：潜在地，火山岩和火山碎屑岩是重要的油气藏岩。在这些岩石中，火山岩材料的低温蚀变（<200摄氏度）和成岩作用是普遍现象，通常可以大大改善储层质量。基于对可用岩心，薄片和扫描电子显微镜（SEM）数据的观察，本文描述了含火山物质的油气藏中复杂的成岩反应集及其在形成次生孔隙中的作用，并提供了科学的地质信息相似储集层质量评价和预测的基础。准gar尔盆地西北缘下二叠统火山岩和火山碎屑岩中的火山岩材料经历了失透，氯化，沸石化，铝化和钙化。基于岩心的孔隙度数据分析表明，在开放的水文系统中，包衣亚氯酸盐和矿物的溶解可以促进良好的孔隙度，特别是在含凝灰岩的碎屑岩中。早期的亚氯酸盐涂层和孔衬层的形成可保留大量的初级孔隙。酸性水溶解了在碱性条件下在沉积相和喷发相中沉淀的沸石，钠长石和方解石，形成了溶解孔。烷化的非等速转变在喷发相和喷出相中均形成了大量次生孔隙。绿泥石和赤铁矿的水泥过多（体积> 4％）会损害储层质量。褐铁矿的溶解对于深层储层质量具有重要意义。粗砾岩与可溶的止痛剂水泥形成许多次生溶蚀孔，是最有利的碎屑储集层。

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