鄂尔多斯盆地古峰庄地区疑似侵入岩体的发现及其地质意义

doi:10.11743/ogg20240110

Abstract

Abstract:

Magmatic rocks within the Ordos Basin are crucial for reconstructing tectono-thermal events， paleogeothermal fields， and petroleum geological processes. Based on the processing and interpretation of high-resolution 3D seismic data， we identify suspected intrusive rock bodies in shallow strata in the Gufengzhuang area， Ordos Basin， marking the first discovery of such geological structures in this area. Furthermore， we characterize their spatial distributions and explore their geological significance. The results reveal six rock bodies interpreted as intrusive rocks in the Gufengzhuang area， most of which are ring- or cloud-shaped in a planar view. As shown on seismic sections， strata closer to the cores exhibit more pronounced chaotic reflections and more significant characteristics of mounded structure. Based on their distribution patterns and seismic reflection characteristics， these intrusive rock bodies as interpreted can be classified into two types： the deep scattered and shallow concentrated type with magma upwelling and the shallow concentrated type with magma upwelling. The geological structures of the former type exhibit chaotic seismic reflections as caused by magma intrusion from deep to shallow， significantly distinct from the seismic reflections of their surrounding rocks. Furthermore， they are characterized by nearly vertical occurrences and associated faults. In contrast， only the shallow strata of the latter type display chaotic mounded seismic reflections （corresponding time slices at 1 000 ms and less）， while the deeper strata show normal layered reflections with almost no disturbance. Analyses suggest that the differential magma upwelling is primarily caused by the presence of pre-existing faults and their quantity， scale， degree of vertical superimposition， and throws at cores and ends， as well as formation pressure. By combining the developmental characteristics and formation eras of other magmatic rocks within the Ordos Basin， this study proposes that the intrusive rock bodies as interpreted in the Gufengzhuang area were formed during the late Early Cretaceous， which is consistent with the scale hydrocarbon generation and accumulation period of Paleozoic-Mesozoic oil and gas， and the hydrothermal activity in this stage is of great importance to the generation， preservation and accumulation of hydrocarbons in this area.

Key words: tectono-thermal event, intrusive rock body, Gufengzhuang area, Ordos Basin

CLC Number:

TE121.2

LiHua YANG, ChiYang LIU, Lei HUANG, Yijun ZHOU, Yongtao LIU, Yang QIN. Discovery of suspected intrusive rock bodies in Gufengzhuang area， Ordos Basin and its geological significance[J]. Oil & Gas Geology, 2024, 45(1): 142-156.

Figures/Tables 9

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Discovery of suspected intrusive rock bodies in Gufengzhuang area， Ordos Basin and its geological significance

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