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- Title
Geologic conditions, resource potential and exploratory direction of deep gas in the northern Songliao Basin.
- Authors
Bai Xue-feng; Liang Jiang-ping; Zhang Wen-jing; Fu Li; Peng Jian-liang; Xue Tao; Yang Li-wei; Liu Ji-ying
- Abstract
According to the geological conditions of the accumulation of deep gas, the northern Songliao Basin is composed of multiple fault depressions and three fault depression zones in eastern,central and western regions.In the east fault depression zone, the fault depression strata are of great thickness and moderate burial depth, which is the focus of exploration. The lacustrine mudstone of Shahezi Formation in fault depression period is the main source rocks with large thickness, wide distribution and favorable hydrocarbon generation conditions. With bedrocks, volcanic rocks and clastic rocks as reservoir, the three sets of reservoir caps (upper, middle and lower) are developed under the control of 2nd member of Denglouku Formation and 1st and 2nd members of Quantou Formation.The central combination is the dominant. It develops four kinds of accumulation models; Bedrock weathering shells, source storage integrated tight gas, source inner volcanic rock,and paleo-uplift belt cover layer.Volcanic rocks of Yingcheng Formation and tight grit rocks of Shahezi Formation are mainly gas-hearing systems.Based on the analyses of geological conditions, adopt genetic method and analogy method are used to recalculate the main fault depression and key exploration layers.The accumulative amount of resources is 1.59 trillion cubic meters. According to geological conditions and the scale of remaining resource, the next step exploration level and direction are further clarified.Among them, the “refining volcanic rock, accelerating tight gas” of Xujiaweizi fault depression is a practical field for the increase of reserve. To increase exploration degree and expand exploration scale in Yingshan-Shuangcheng fault depression and paleo-central uplift beltis an important replacement field. Strengthen risk exploration in Lindian-Gulong fault depression and strive for breakthrough.
- Subjects
GEOLOGY; NATURAL gas; GAS reservoirs; HYDROCARBONS; NATURAL gas prospecting
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 10, p1443
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.08.006