A method for classifying genetic types of deep water channels

Abstract

The invention discloses a method for classifying the genetic types of deep water channels, which divides the channels into the following types: a. high-density turbidity flow single-fill waterway; b. low-density turbidity flow single-fill waterway; c. debris flow-filled waterway; d. Massive sandy mixed-filled channel; e. Gravel-containing sandy mixed-filled channel; f. Layered sandy mixed-filled channel; g. Sandy mixed-filled channel with debris; h. Equal phase mixed-filled channel; A gravel mix fills the waterway. Based on the lithofacies type of the filling volume inside the channel, the present invention realizes the precise division of a single channel type, and solves the problem that the traditional scheme is difficult to apply to deep water channel field outcrops and drilling coring data, thereby providing a basis for the analysis of deep water channel deposition process and deposition style It provides important geological basis and guidance for the analysis of different channel genesis types, etc. Therefore, the present invention has important indicating significance for the characterization of a single channel scale configuration in deep water deposits and the exploration of channel reservoirs.

Description

technical field [0001] The invention relates to the technical field of geological exploration for oil and gas field development, in particular to a method for classifying genetic types of deep water channels. Background technique [0002] Deep-water channels are widely developed in continental shelf slopes, deep lakes, and deep-water plains and basins. They are the main channels and deposition sites for terrigenous sediments to migrate to deep-water basins, and are also the focus of current deep-water oil and gas exploration and development. However, affected by factors such as tectonic movement, sea level rise and fall, provenance supply, and climate conditions, the geometry of deep-water channel sand bodies is complex and changeable, and the types of rock flushing and filling are changeable and have strong heterogeneity. When the inside of the channel is mainly filled with sandstone, its porosity and permeability are relatively good, which can provide a favorable place for...

AI Technical Summary

Problems solved by technology

However, in the actual application process such as oilfield underground core description and field outcrop investigation, the key basis for this method to classify water channel types—“erosion ability strength” is difficult to judge through local and low-resolution information, which makes the method The method relies too much on the "channel profile shape" in practical application

Unfortunately, in most cases, it is difficult to fully display the shape of the water channel section. For example, due to the limitation of poor outcropping conditions and large-scale water channels, most outcrops in the world cannot show the complete water channel profile; another example is the description of underground oil reservoir cores. At that time, the core is only a view of a hole, which reflects the "one-dimensional" geological information at a certain point of the channel body, so it is extremely difficult to judge the shape of the channel section

Therefore, the current mainstream channel classification method is difficult to apply to field outcrops and oilfield practices, and it is urgent to invent a practical and new deep-water channel genetic type classification method

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