Gravitational and magnetic surveys are important exploration methods for oil and gas. With increasing complicity of exploration targets, 3D gravity and magnetic exploration will play a more important role than the conventional gravity and magnetic surveys. 3D gravitational and magnetic exploration techniques include 3D acquisition, processing and inversion. Of these, the 3D inversion technique is key. 3D gravitational and magnetic techniques are expected to play an important role in studying deep‐seated objectives and detailed structure interpretation.
Summary Deep oil and gas resources have great potential, which is an important area of oil and gas exploration in China. However, the gravity signals of deep targets are weak and superimposed abnormally, which requires the supporting technique of gravity survey for deep targets. This paper puts forward the basic technical process needed for deep gravity exploration. The key techniques include gravity stripping and joint inversion with gravity and magnetic constraints, and introduces the new progress of directional filtering and gradient anomaly inversion. Gravity survey for deep oil and gas needs supporting techniques such as high-precision acquisition processing and system design, and more importantly, collaborative innovation of multiple methods and data in gravity, magnetic, electric and seismic. The examples show that deep gravity exploration can play an important role in deep complex structure and lithology. With the development of domestic oil and gas exploration activities in China, it is necessary to advance to deep exploration; deep gravity exploration technology will develop faster and provide important technical support for the exploration of deep buried hills, deep rifts, volcanic rocks, bedrock lithology, new strata and other deep targets, play an important role in the comprehensive exploration using gravity, magnetism, electricity and seismic method.
In oil & gas exploration, magnetic anomaly caused by reverse remanent magnetism is often ignored. With the exploration step moving to the fine stage, this problem needs to be paid great attention by the processing and interpretation researcher. In large area data processing, it is difficult to identify and separate the reverse remanent magnetic anomalies, some of the reverse magnetic anomalies need to be identified with the cooperation of processing means. Further more, we can carry out inversion and interpretation to achieve correct interpretation and comprehensive geological research. Presentation Date: Tuesday, October 13, 2020 Session Start Time: 1:50 PM Presentation Time: 2:40 PM Location: Poster Station 6 Presentation Type: Poster
Strike-slip faults are one of the most important types of faults, and strike-slip faults or transcurrent faults often play an important role in the process of oil and gas accumulation. The gravity and magnetic methods have the advantages of areal exploration and large exploration depth, and are important exploration methods for studying strike-slip faults or transcurrent faults. Due to the complexity of actual geological problems and the superposition of potential fields, it is difficult to interpret strike-slip faults or transcurrent faults in some areas. In view of this difficulty, this paper proposes a comprehensive method of fine processing of gravity magnetic anomalies, stripping processing, multi-information superposition and directional filtering to study strike-slip faults, which makes up for the shortage of single information of gravity gradient anomalies. The case study shows that the advantages of gravity and magnetic anomaly weak information extraction and multi-information superposition are conducive to the fine interpretation and determination of strike-slip faults, which can provide a unique data basis for geological research, and have important value for oil and gas target evaluation research.
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