Interwell sand body static connectivity evaluation method based on sedimentary environment and evaluation scale

Abstract

The invention relates to an inter-well sand body static connectivity evaluation method based on a sedimentary environment and an evaluation scale. The inter-well sand body static connectivity evaluation method comprises the following steps: step 1, identifying and dividing a single sand body conduction layer; 2, taking the sand-to-ground ratio of the stratum, the sedimentary environment, the evaluation scale and the sand body geometric parameters as main evaluation control factors of the conducting layer, taking one evaluation main control factor as an object, and respectively determining the control effects of the other three evaluation main control factors on the static connectivity of the conducting layer by adopting a factor control method; step 3, establishing a three-dimensional static connected model of the single sand body conducting layer, realizing modeling by applying petrel geological modeling software, and realizing quantitative output; and 4, performing quantitative judgment based on the static connectivity trap type of the sand body. According to the method, the evaluation result of the static connectivity probability of the sandstone conducting layer is controlled by the sand-to-ground ratio of the stratum, the sedimentary environment, the evaluation scale and the geometric parameters of the sand body for the first time, and quantitative evaluation of the static connectivity of the sand bodies of different cause types is realized.

Description

Technical field: [0001] The invention relates to the field of petroleum and natural gas exploration, in particular to a static connectivity evaluation method of interwell sand bodies based on depositional environment and evaluation scale. Background technique: [0002] The most important reservoir in clastic rock reservoirs is sandstone. Sand bodies can be used as oil and gas migration channels and good storage places. The key factor for the long-distance migration of parts, and the sandstone carrier layer is one of the main channels for oil and gas migration. The static connectivity of the sandstone carrier layer is the frontier and weak link of current sedimentology research, and its connectivity affects oil and gas migration. Pathway and play evaluation are the key geological factors controlling oil and gas migration and accumulation. The sandstone carrier layer is defined as: a formation unit with a certain thickness under the regional caprock, which is the sum of sands...

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad have achieved certain results in the evaluation of the static connectivity of the sandstone transport layer in terms of its main controlling factors and evaluation methods, but there are still the following deficiencies: (1) The current evaluation object of the static connectivity of the sandstone transport layer is a simple river There are few reports on reservoirs with fast sedimentary facies change, many types of sand bodies, and strong heterogeneity; (2) Although a few foreign scholars have studied the static connectivity of fluvial sand bodies with different evaluation scales, domestic scholars When carrying out the research on the static connectivity of sand bodies, only the formation sand-to-ground ratio is considered, and the influence of the evaluation scale on the static connectivity of sand bodies between wells is ignored

Images