New discovery of sandy debris flow sandbody and its implications for oil and gas exploration in the Junggar Basin

被引：0

作者：

Hou G. ^{[1
]}

Zeng D. ^{[2
]}

Niu Z. ^{[2
]}

Wang L. ^{[1
]}

Song B. ^{[1
]}

Guo H. ^{[1
]}

Shan X. ^{[1
]}

Dou Y. ^{[1
]}

Li Y. ^{[1
]}

Peng B. ^{[1
]}

机构：

[1] PetroChina Hangzhou Institute of Geology, Hangzhou

[2] Exploration and Development Research Institute, PetroChina Xinjiang Oilfield Company, Karamay

来源：

Natural Gas Industry | 2020年 / 40卷 / 11期

关键词：

Favorable oil and gas exploration area; Junggar Basin; Lithologic trap; Lower Jurassic Sangonghe Formation; Sandy debris flow; Western Well Pen-1 sag;

D O I：

10.3787/j.issn.1000-0976.2020.11.005

中图分类号：

学科分类号：

摘要：

In order to find out whether effective sand bodies are developed and lithologic traps are ascertained in the sag areas of the Junggar Basin, this paper analyzes the paleogeomorphology, sedimentary microfacies, reservoir property and petroliferous property of the second Member of Lower Jurassic Sangonghe Formation in the western Well Pen-1 sag of the Junggar Basin by means of core observation, heavy mineral analysis, reservoir characterization and seismic reflection characteristics analysis. Then, the lithologic trap conditions of sandy debris flow sandbody are evaluated. Finally, the direction of next natural gas exploration in the Sangonghe Formation of the Junggar Basin is pointed out. And the following research results were obtained. First, in the second Member of Sangonghe Formation around the western Well Pen-1 sag develops a slope break belt, above which a delta front sandbody is developed. Under the trigger of Yanshanian tectonic activity, the semi-deep lake slumping below the slope break belt develops into a sandy debris flow sandbody. Second, the sandy debris flow sandbody is thick. It vertically has a structure of "sandstone in mudstone" and laterally is separated from the sandbody of front facies through a muddy belt. Therefore, its sealing conditions are better and lithologic trap conditions are favorable. Third, the sandy debris flow sandbody has good reservoir physical properties and is classified into the category of moderate-better reservoir. And its petroliferous property is overall better. In conclusion, a sandy debris flow sandbody is developed in the Sangonghe Formation of the Junggar Basin. It has favorable lithologic trap conditions and is of great significance to oil and gas exploration. In addition, a great breakthrough of oil and gas exploration is realized by drilling new wells, on the basis of the research results. It is confirmed that the sandy debris flow sandbody below the slope break belt has favorable conditions for the formation of lithologic oil and gas reservoirs and it is the most favorable new field of next natural gas exploration in this area. © 2020, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：41 / 49

页数：8

共 32 条

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