Development characteristics of grain shoals and favorable gas exploration areas in the 4th Member of Ordovician Majiagou Formation in the Ordos Basin

被引：0
|
作者：
Zhou J. [1 ,2 ]
Yin C. [3 ]
Zeng L. [3 ]
Hu C. [4 ]
Wu D. [1 ,2 ]
Yu Z. [1 ,2 ]
Li W. [1 ]
Tang J. [5 ]
Liu Y. [3 ]
Jia J. [3 ]
机构：
[1] PetroChina Hangzhou Research Institute of Geology, Zhejiang, Hangzhou
[2] CNPC Key Laboratory of Carbonate Reservoir, Zhejiang, Hangzhou
[3] College of Geosciences, China University of Petroleum <Beijing>, Beijing
[4] PetroChina Changqing Oilfield Company, Shaanxi, Xi'an
[5] China National Logging Corportation, Shaanxi, Xi'an
来源：
Natural Gas Industry | 2022年 / 42卷 / 07期
关键词：
4[!sup]th[!/sup] Member of Majiagou Formation (Ma4 Member); Distribution law; Favorable exploration area; Intra-platform grain shoal; Marginal platform grain shoal; Ordos Basin; Ordovician;
D O I：
10.3787/j.issn.1000-0976.2022.07.003
中图分类号：
学科分类号：
摘要：
Recently, Well MT 1 has obtained high-yield gas flow from the 4th Member of Ordovician Majiagou Formation ("Ma4 Member") in the central-eastern Ordos Basin, indicating a breakthrough in natural gas exploration here, which arouses wide attention of scientific researchers to the grain shoal reservoir of Ma4 Member. At this stage, however, the research results on the grain shoal of Ma4 Member can not meet the needs of its exploration deployment. Based on previous research results, this paper studies the types and geological characteristics of the Ma4 Member grain shoal and the vertical superposition relationships and lateral distribution laws of beach bodies by using the data of field outcrop, drilling core, microscopic thin section and logging, combined with the geological setting for the formation of the Ma4 member grain shoal. In addition, the main factors controlling the development of grain shoals are determined, and the next natural gas exploration direction is pointed out. And the following research results are obtained. First, in the Ma4 Member of the Ordos basin develop marginal platform grain shoals and intra-platform grain shoals, which are formed by the superposition of multi-stage beach bodies. The single-layer thickness of marginal platform grain shoals is generally 1.1-51.0 m and the cumulative thickness is 20.5-206.3 m, while the single-layer thickness of intra-platform grain shoals is 1.1-4.5 m and the cumulative thickness is 5.1-48.4 m. Second, the development of grain shoals is closely related to sea level change. There are three fourth-order sea level change cycles in the Ma4 Member, namely Ma43 rapid transgression, Ma42 slow regression and Ma41 oscillatory slow regression. Vertically, the grain shoals are mainly developed in the Ma42 and Ma41 submembers. Each fourth-order cycle includes multiple fifth-order high-frequency cycles, and grain shoals are developed at the upper parts of high-frequency cycles. Third, the development of grain shoals is controlled by paleogeomorphology as well. The marginal platform grain shoals are distributed in the central uplift belt, and the intra-platform grain shoals are distributed in Shenmu-Yulin-Hengshan area. Grain shoals are not developed in low-lying areas. Fourth, the grain shoal is the basis of reservoir development and controls the distribution of favorable reservoirs. In conclusion, Shenmu-Yulin-Hengshan area is a favorable natural gas exploration direction in the follow step. These research results provide a theoretical support for the evaluation and target selection of Ma4 Member favorable exploration areas. © 2022 Natural Gas Industry Journal Agency. All rights reserved.
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页码：17 / 30
页数：13
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