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A Study on Formation Conditions of Deep Gas and Anatomy of a Typical Oil and Gas Reservoirs in the Western Qaidam

Author: JiangXiaoQing
Tutor: SunBaiNian
School: Lanzhou University
Course: Paleontology and stratigraphy
Keywords: The western part of the Qaidam Basin Deep gas Forming rules Exploration potential
CLC: P618.13
Type: Master's thesis
Year: 2009
Downloads: 235
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Abstract


Exploration of the Qaidam Basin, the western region for nearly a decade of research and production practice, we found it difficult to find a new shallow gas reservoirs, passive situation caused by the long stagnant basin gas exploration. However, due to the deep gas exploration by the impact of the three major risk traps implemented, reservoir characteristics and trap effectiveness, combined with exploration investment in high, not enough to grasp difficult to be determined to drilling. Therefore believes that it is necessary to further develop the western region of the Qaidam Basin, the distribution pattern of deep gas reservoirs and favorable exploration target selection. The papers by logging, seismic data processing and interpretation technology and basin modeling technology, starting from the structure and sedimentary evolution of the western Qaidam Basin deep petroleum system analysis, describe the distribution and quality of the reservoir and cap, the implementation of trap type and size, to dissect the deep gas transporting network and the migration direction, clarify the deep gas accumulation conditions, the accumulation process of forming rules, noting that the favorable zones for deep gas exploration. Clear through the analysis of the geochemical characteristics of hydrocarbon source rocks in this area, the quality of the main hydrocarbon source rocks for hydrocarbon capacity, that: the Western Qaidam Tertiary development of E 2 , E , 3 1 E 3 2 and N 1 , etc. four sets of source rocks, mainly distributed within the the Mangya oil generation depression, from the E-N 1 basically mainly to partial sapropel hybrid. Comprehensive evaluation of the reservoir area found that the western Qaidam reservoir rock reservoir pore clastic reservoirs, vuggy the algal limestone reservoir and fractured clay (gray) three categories. Reservoir of deep clastic reservoirs and fractured reservoirs. The fractured marl reservoir, its hole permeability changes, strong heterogeneity, often concentrated in the structure axis the Ministry or high parts in Nanyishan Youquanzi open Terme Rick structures on dry the chaigou group (N 1 ), Youshashan (N the 2 ) and other relatively developed. Third of the District Department of existence of deep, the shallow two sets of regional cap rock lithology calcilutyte gypsum rock, marl. Deep regional cap rocks are widely distributed throughout the western region almost thickness E 3 2 -N 1 lake phase lime mudstone, marl, and in connection with interbedded salt layers, including gypsum and salt layer is ideal caprock deep oil and gas reservoirs. Of Western Qaidam can be divided into two types of conduit system: sand body and fault the composite conduit system and fault conduit system. The deep gas formed in the fault conduit system, so deep gas migration distance is limited to vertical migration of the main. Consolidated acquired geological and reservoir elements characteristic that plenty of conditions of the Western Qaidam deep gas source, better storage conditions, and conditions of deep gas reservoir. And on this basis that the favorable zones of deep gas exploration in Western Qaidam depression Mangya internal Youquanzi open Terme Rick and Mangya surrounding South Wing Mountain.

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