Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 34-41.doi: 10.3969/j.issn.1673-8926.2017.03.005

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Characteristics and formation conditions of tight tuff reservoir of Tiaohu Formation in Malang Depression

XU Xiongfei1, WEN Chuanjiang1, LI Yuping2, REN Zhongyue1, XIAO Dongsheng1, FENG Yaqin1   

  1. 1. Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China;
    2. Tuha Drilling Company, PetroChina Western Drilling and Exploration Engineering Company, Shanshan 838200, Xinjiang, China
  • Received:2016-09-16 Revised:2016-10-24 Online:2017-05-21 Published:2017-05-21

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Abstract: The tight tuff reservoir of Tiaohu Formation in Malang Depression has become one of the key fields for exploration in Santanghu Basin in recent years. The reservoir characteristics and formation conditions are of great significance for deepening the exploration of tight tuff reservoir in Santanghu Basin. Based on the data of core observation,thin sections,whole rock X-ray diffraction,field-emission scanning electron microscope and mercury capillary pressure,the micro-characteristics of tight tuff reservoir were studied,and the distribution of tight tuff reservoir were characterized according to the data of amplitude,frequency by combining drilling and seismic method. The results show that the tight tuff reservoirs are mainly composed of crystal chips and glass chips,and rich in organic matter,with devitrified pores developed. The reservoir has the features of medium porosity,ultra-low permeability and high oil saturation. The stable shallow-semi deep lacustrine environment which is lacking of terrigenous materials is the key for forming tight tuff reservoir,volcanic depression within a certain range from the volcanic apparatus controls the distribution of effective tight tuff reservoir,and devitrification and dissolution are critical for improving the reservoir properties of tuff. The volcanic depressions in the northern slope area of Malang Depression are favorable for the development of tight tuff reservoir,the west blocks of L1 well and east blocks of L104 well,south west blocks of M7 well in Malang Depression are the next favorable targets for tight oil exploration.

Key words: organic-rich shales, organic geochemical characteristics, Niutitang Formation, northwestern margin of Upper Yangtze platform

CLC Number: 

  • TE122.2
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