System and method of typing heterogeneous reservoir rocks
AssigneeSaudi Arabian Oil Company
InventorsMing Zhang, Hongwen Zhao, Yufeng Cui, David Amendt, Peng Lu
Life of this patent
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Abstract
A method of rock typing includes obtaining mercury injection capillary pressure (MICP) data regarding a region of interest. A distance matrix is computed for distributions determined from the MICP data using a statistical distance metric. A cluster tree of the distributions is generated using the distance matrix. The cluster tree is adjusted based on a petrographic characteristic to produce an adjusted cluster tree, which is used to determine a pore structure types of the region of interest.
Claims15
A method of rock typing comprising:
- selecting a plurality of core samples from a region of interest;
- obtaining, by a computer processor, mercury injection capillary pressure (MICP) data regarding the region of interest from the plurality of core samples using an MICP measurement device;
- determining, by the computer processor, a plurality of distributions from the MICP data;
- computing, by the computer processor, a distance matrix for the plurality of distributions using a statistical distance metric;
- generating, by the computer processor and using the distance matrix, a cluster tree of the plurality of distributions;
- performing a petrographic analysis of the plurality of core samples to identify a number m of rock types represented in the region of interest,
- adjusting, by the computer processor, the cluster tree using as input the number m of rock types to produce an adjusted cluster tree;
- and
- determining pore structure types of the region of interest based on the adjusted cluster tree.
A method of rock typing comprising:
- selecting a plurality of core samples from a region of interest;
- acquiring mercury injection capillary pressure (MICP) data from MICP testing of the plurality of core samples;
- obtaining a plurality of mercury saturation as a function of mercury injection pressure curves (MICP curves) from the MICP data;
- computing a distance matrix for the MICP curves using Wasserstein distance as a distance metric;
- generating a cluster tree of the MICP curves;
- performing a petrographic analysis of the plurality of core samples to identify a number m of rock types represented in the region of interest;
- extracting a number k of clusters from the cluster tree based on a number of m of rock types represented in the region of interest, wherein k>1, and wherein the number k matches the number m;
- and
- outputting the clusters to a well-log-based rock typing to classify pore structure types of the region of interest.
A non-transitory computer-readable medium including one or more sequences of instructions that when executed by at least one processor cause the at least one processor to:
- obtain mercury injection capillary pressure (MICP) data from an MICP measurement device regarding a region of interest;
- determine a plurality of distributions from the MICP data;
- compute a distance matrix for the plurality of distributions using a statistical distance metric;
- generate a cluster tree of the plurality of distributions using the distance matrix;
- receive as input a number m of rock types obtained from a petrographic analysis of a plurality of core samples from the region of interest;
- adjust the cluster tree based on the number m of rock types to produce an adjusted cluster tree;
- and
- determine pore structure types of the region of interest based on the adjusted cluster tree.
Dependencies are inferred from the claim text.