Carbonate fractured-vuggy reservoir is the most complex reservoir type in the world because of its complex controlled factors

strong heterogeneity and diverse reservoir rock types. There are many reservoir types such as caves

holes and fractures in the whole reservoir unit. The traditional description of single parameter system restricts the detailed description of underground geological bodies. According to the standards of SEC proved reserves

how to establish a scientific geological model

determine the parameters such as proved area

proved effective thickness and recovery rate

estimate various levels of geological reserves and technical recoverable reserves

confirm the number of undeveloped wells

and predict the reasonable proved reserves in the future is facing a great challenge. Therefore

the SEC reserve evaluation of a typical fault zone in Shunbei Oilfield is taken as an example

and the Ordovician reservoir in this well area is subdivided into three types

namely cavern reservoir

hole reservoir and fracture reservoir

to calculate the geological reserves respectively by using the mature reservoir prediction technology in this area. When confirming reserve evaluation

by combining a variety of the evaluation methods

such as static proved reserves evaluation method

analogy method and dynamic method

on the one hand

evaluating the dynamic rules of the developed wells to contrast its actual diminishing and forecast for verifying its rationality; on the other hand

confirming the reliability of the position of undeveloped wells by the judgment of distribution rule of fault-karst reservoir

and verifying the reliability of the forecast by the actual production changes after putting on production. Finally

a set of techniques and methods for SEC reserve evaluation of such reservoirs is formed

which has guiding and reference significance for ensuring the rationality of evaluation.