准噶尔盆地滴西地区石炭系火山岩识别与预测

准噶尔盆地腹部滴西地区石炭系火山岩储层中已获重要的工业气流。然而由于成岩环境复杂,岩性多变,火山机构受后期风化剥蚀和构造作用的影响,保存不完整,使得该区火山岩研究难度大,认识程度较低。本文对滴西地区石炭系巴塔玛依内山组火山岩特征进行了研究,分析了该区典型岩性的岩心、岩石薄片及测井响应特征,提出了一套火山岩测井识别的方法。在此基础上,总结了典型岩性组合的地震反射特征,并对岩性的展布情况进行了预测。最后,对火山岩形成的环境进行了探讨。研究结果显示,滴西地区巴塔玛依内山组顶面的火山岩分布具有一定的分段特征,可以分为东部、中部、西部三段: 从成分上看,东部以酸性岩为主,西部以基性岩为主,中部则酸性岩、中性岩和基性岩皆较发育; 从火山岩产状上看,东部和西部以喷出产状为主,中部则侵入产状和喷出产状皆发育。巴塔玛依内山组火山岩体具有多期次的特点,各火山机构彼此叠置,时间和空间上具有一定的相关性。层状火山机构发育。本文的研究方法对准噶尔盆地内石炭系火山岩研究及火山机构的解剖具有借鉴意义,同时也为该区的油气勘探和开发提供一定的依据。

The identification and prediction of Carboniferous volcanic rocks in Dixi area, Junggar basin

The important industrial gas has been developed from the Carboniferous volcanic reservoir in Dixi area, Junggar basin. However, it makes the research to the Carboniferous volcanic rocks in this area difficult for its complex diagenesis environment, incomplete preservation due to deuteric weathering and denudation, and diverse lithology. In this paper, the characteristics of Batamayineishan Formation of Carboniferous volcanic rocks in Dixi area were studied in detail. The features of rock cores, thin sections and response of well logging were analyzed. A suit of methods for identifying the lithology were presented. The seismic response characteristics of typical combined rocks were summarized and the distribution of dominant lithology was predicted. The research shows that the distribution of volcanic rocks can be divided into 3 segmentations, the east, the centre and the west, for the top zone of Batamayineishan Formation in the research area. From the viewpoint of lithology, the east segment is mainly acidic volcanic rocks, the west segment is mainly basic volcanic rocks, and the basic, intermediate and acidic volcanic rocks are all well developed in the centre segment. From the viewpoint of occurrence, effusive occurrence dominates the east and west segments, both effusive and intrusive occurrence are well developed in the centre segment. The characteristics of multi-stage of the volcanic rocks can be found, the volcanic edifices are overlayed one by one and show some relationship for time and space. Stratovolcano edifice is well developed in the research area. The methods used in this paper are available to the anatomy of volcanic rocks and volcanic edifices in other areas of this basin, and they also can be used as some basis for the exploration and development of the oil and gas in this area.