Evaluation method for conglomerate reservoir in tectonic extrusion area

Abstract

The invention relates to the technical field of petroleum and natural gas exploration and development, and discloses a method for evaluating a conglomerate reservoir in a tectonic extrusion area. The method for evaluating the conglomerate reservoir in the tectonic extrusion area comprises the following steps: selecting a coring well with complete conglomerate drilling data at different tectonic extrusion positions in a research area, and collecting geological data related to the scheme as much as possible, including core logging data, core samples, casting body slices and actually measured pore permeability data; the number and name of wells with drilling coring are determined. An evaluation standard of the conglomerate reservoir in the tectonic extrusion area is established according to the relationship between the content of corroded gravel and the content of broken gravel which are microcosmically counted in the conglomerate reservoir, and a basis is provided for prediction and evaluation of the quality of the conglomerate reservoir in a similar area, so that a logging information evaluation result is always very small in difference from actually measured pore permeability data of a rock core; the method has a great effect in the aspect of predicting a high-quality conglomerate reservoir in a tectonic extrusion area, does not damage a precious rock core, and is relatively low in testing cost, so that the method can be popularized in a large area.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to an evaluation method for conglomerate reservoirs in structural extrusion areas. Background technique [0002] Both oil and natural gas occur in reservoirs, and reservoir evaluation is a very important basic work in the process of oil and gas exploration and development. Without high-quality reservoirs, there will be no high reserves and high production of oil and gas reservoirs. In my country, the potential of clastic rock oil and gas resources is huge. At present, with the discovery of large-scale glutenite reservoirs in the Mahu sag of the Junggar Basin, research on conglomerate reservoirs is imminent. Reservoir quality and its evaluation are one of the key factors restricting conglomerate oil and gas exploration. The important influence of tectonic action on the diagenetic transformation mechanism of clastic rock reservoirs has been widely rec...

AI Technical Summary

Problems solved by technology

[0004] However, the above methods have certain problems: (1) Due to the large particle size of the debris in the conglomerate, it is necessary to use a large-diameter plunger sample when performing core porosity and permeability tests, which will damage and waste precious Core, combined with the high cost of testing, it is difficult to popularize in a large area; this method does not involve the origin of the reservoir, and the prediction function is poor

(2) The method based on core gravel composition analysis does not consider the impact of gravel extrusion and fracture on reservoir quality, and in areas with strong structural compression, reservoirs at different structural positions mostly come from the same provenance area, and the gravel composition Little change overall

(3) Calculating the physical parameters of conglomerate reservoirs using geophysical logging data is an indirect evaluation method. The determination of rock skeleton parameters and the selection of mathematical models have a great impact on the final calculation results; for conglome

Images