Geological conditions of natural gas accumulation and new exploration areas in the Mesoproterozoic to Lower Paleozoic of Ordos Basin, NW China
| Autor: | Jing Wang, Rong Wanyan, LI Xiangbo, Jinhu Du, Yating Wang, Hongbo Wang, Wanglin Xu, Hongping Bao, Junping Huang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
geography.geographical_feature_category Paleozoic Outcrop 0211 other engineering and technologies Geochemistry Energy Engineering and Power Technology Geology 02 engineering and technology Structural basin 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Craton Source rock Geochemistry and Petrology lcsh:TP690-692.5 Facies Ordovician Economic Geology 021108 energy Oceanic basin lcsh:Petroleum refining. Petroleum products 0105 earth and related environmental sciences |
| Zdroj: | Petroleum Exploration and Development, Vol 46, Iss 5, Pp 866-882 (2019) |
| ISSN: | 1876-3804 |
| DOI: | 10.1016/s1876-3804(19)60246-6 |
| Popis: | Based on field outcrop investigation, interpretation and analysis of drilling and seismic data, and consulting on a large number of previous research results, the characteristics of ancient marine hydrocarbon source rocks, favorable reservoir facies belts, hydrocarbon migration direction and reservoir-forming law in the Ordos Basin have been studied from the viewpoints of North China Craton breakup and Qilian-Qinling oceanic basin opening and closing. Four main results are obtained: (1) Controlled by deep-water shelf-rift, there are three suites of source rocks in the Ordos Basin and its periphery: Mesoproterozoic, Lower Cambrian and Middle-Upper Ordovician. (2) Controlled by littoral environment, paleo-uplift and platform margin, four types of reservoirs are developed in the area: Mesoproterozoic– Lower Cambrian littoral shallow sea quartz sandstone, Middle-Upper Cambrian–Ordovician weathering crust and dolomitized reservoir, and Ordovician L-shape platform margin reef and beach bodies. (3) Reservoir-forming assemblages vary greatly in the study area, with “upper generation and lower storage” as the main pattern in the platform, followed by “self-generation and self-storage”. There are both “upper generation and lower storage” and “self-generation and self-storage” in the platform margin zone. In addition, in the case of communication between deep-large faults and the Changchengian system paleo-rift trough, there may also exist a “lower generation and upper reservoir” combination between the platform and the margin. (4) There are four new exploration fields including Qingyang paleo-uplift pre-Carboniferous weathering crust, L-shape platform margin zone in southwestern margin of the basin, Ordovician subsalt assemblage in central and eastern parts of the basin, and Mesoproterozoic–Cambrian. Among them, pre-Carboniferous weathering crust and L-shape platform margin facies zone are more realistic replacement areas, and Ordovician subsalt assemblage and the Proterozoic-Cambrian have certain potential and are worth exploring. Key words: natural gas exploration area, hydrocarbon accumulation geological conditions, Mesoproterozoic, Neoproterozoic, Lower Paleozoic, Ordos Basin |
| Databáze: | OpenAIRE |
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