鄂尔多斯盆地怀远运动不整合面特征及油气勘探意义

doi:10.11743/ogg20210503

Abstract

Abstract:

The unconformity formed out of Huaiyuan Movement is one of the important regional unconformities in the North China Platform.Following the investigation on and analysis of the occurrence and geological characteristics of the movement, we make an in-depth analysis of the evidences and characteristics manifesting the movement-caused unconformity and its correlation with reservoirs and oil and gas accumulation in the Ordos Basin, with new understandings obtained.The results show that: ①There is a regional unconformity formed by the Huaiyuan Movement in the deep Ordovician of Ordos Basin, and it perhaps associates with a large-scale geomorphology system of karst ravines; ②The regional unconformity and ravine system serve as the paleogeomorphologic setting for the deposition of the overlying strata, to be specific, the middle-to-bottom parts of Majiagou Formation (namely, from Ma 4 to Ma 1 Members), and control the depositional pattern and favorable reservoir facies distribution, as well as the development of dolomitized and weathered crust reservoirs in the underlying Lower Ordovician to Cambrian and to Changcheng Systems; ③The regional unconformity acts as a favorable channel for the lateral migration of natural gas from different sources in certain regions, known as "highway of hydrocarbon migration"; meanwhile, it is also a favorable place for hydrocarbon accumulation, the upper and lower layers near which are conducive to natural gas accumulation and enrichment in large scale.It is possibly a new exploration area worthy of attention in replacement of weathering crust on top of the Ordovician.However, the current understandings have to be deepened on the unconformity in the study area, for which a 3D seismic acquisition is recommended to promote creative geological understandings and new exploration discoveries in the Ordos Basin.

Key words: dolomitization, weathering crust, unconformity, Huaiyuan Movement, palaeogeomorphology, Majiagou Formation, Ordos Basin

CLC Number:

TE121.2

Xiangbo Li, Hongbo Wang, Junping Huang, Caili Zhang, Yan Zhang, Yating Wang, Lei Zhang, Jing Wang, Huaqing Liu. Characteristics of unconformity resulted from Huaiyuan Movement in Ordos Basin and its significance for oil and gas exploration[J]. Oil & Gas Geology, 2021, 42(5): 1043-1055.

Figures/Tables 9

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Characteristics of unconformity resulted from Huaiyuan Movement in Ordos Basin and its significance for oil and gas exploration

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