Method for identifying mountain front deep part construction layer through utilizing gravity interface inversion

Abstract

The invention provides a method for identifying a mountain front deep part construction layer through utilizing gravity interface inversion and is a gravity density interface inversion method for difficulty in depicting deep part stratum structure attributes during mountain front oil gas target exploration. The method comprises steps that gravity potential field data pre-processing is carried outto form basic data before data inversion; different target area lithology and stratum physical property rules are analyzed, and physical property base of density interface inversion is made to be clear; a variable density physical property model is established, and an inversion physical property model is provided; gravity-earthquake combined step by step fine delamination is carried out, and superposition field source separation precision is enhanced; drilling well-earthquake constraints are added to the space domain, and interface constraints are provided by skeleton profile combined inversion; gravity density interface three-dimensional inversion is developed, and the geological structure attributes of the mountain front deep part construction layer is made to be clear. The method is advantaged in that distribution characteristics of the mountain front deep part construction layer is effectively depicted, geological basis is provided for mountain front deep oil gas exploration, andoil gas exploration risks are reduced.

Description

Technical field [0001] The invention relates to the technical field of processing, inversion and comprehensive geological interpretation of geophysical data in the field of oil and gas exploration, in particular to a method for identifying the geological attributes of deep structural layers in piedmont zones based on gravity density interface inversion. Background technique [0002] The Junggar Basin is the main position for oil and gas exploration in western China. With the increase in exploration and research, especially the discovery of the Kelamei gas field in the Junggar Basin and the Niudong oil and gas field in the Santanghu Basin, the Carboniferous in northern Xinjiang has become an important hydrocarbon-bearing strata. , Is a new area of ​​regional oil and gas exploration, with great strategic significance. However, there are many difficulties in the interpretation of seismic data in the process of target exploration in the periphery of the Junggar Basin, especially in t...

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Problems solved by technology

However, there are many difficulties in the interpretation of seismic data in the process of target exploration in the periphery of the Junggar Basin, especially in the complex structural belt in the piedmont. The main reason is that the seismic geological conditions are poor and the structure is complex, which leads to weak seismic reflection signals in deep layers and unclear reflection interfaces. In addition, there are few exploratory wells in some areas, and it is difficult to carry out effective well location calibration, resulting in difficulty in layer tracking, inaccurate interpretation of structures and interfaces, and unclear understanding of deep structural attributes, which cannot meet the needs of exploration research, affecting basin target selection and risks. Well Evaluation Deployment

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