Sains Malaysiana 46(11)(2017): 2223-2229

http://dx.doi.org/10.17576/jsm-2017-4611-24

 

Application of Multivariate Membership Function Discrimination Method for Lithology Identification

(Aplikasi Kaedah Diskriminasi Fungsi Keahlian Multivariat untuk Pengenalan Litologi)

 

JUN ZHAO*, FEIFEI WANG & YIFAN LU

 

Southwest Petroleum University, Chengdu 610500, China

 

 

Received: 17 February 2017/Accepted: 31 May 2017

 

ABSTRACT

Formation lithology identification is an indispensable link in oil and gas exploration. Precision of the traditional recognition method is difficult to guarantee when trying to identify lithology of particular formation with strong heterogeneity and complex structure. In order to remove this defect, multivariate membership function discrimination method is proposed, which regard to lithology identification as a linear model in the fuzzy domain and obtain aimed result with the multivariate membership function established. It is indicated by the test on lower carboniferous Bachu group bioclastic limestone section and Donghe sandstone section reservoir on T Field H area that satisfactory accuracy can be achieved in both clastic rock and carbonate formation and obvious advantages are unfold when dealing with complex formations, which shows a good application prospect and provides a new thought to solve complex problems on oilfield exploration and development with fuzzy theory.

 

Keywords: Fuzzy theory; lithology identification; logging interpretation; multivariate membership function

 

ABSTRAK

Pengenalan kepada formasi litologi adalah pautan yang amat diperlukan dalam penerokaan minyak dan gas. Ketepatan pengiktirafan kaedah tradisi adalah sukar dijamin apabila cuba untuk mengenal pasti formasi litologi untuk formasi tertentu dengan keheterogenan yang tinggi serta struktur yang kompleks. Untuk menghapuskan kesilapan ini, kaedah diskriminasi fungsi keahlian multivariat dicadangkan, dengan pengenalan litologi sebagai model linear dalam domain kabur dan mendapat keputusan yang diinginkan dengan penubuhan fungsi keahlian multivariat. Ini ditunjukkan dengan ujian ke atas Karbon Rendah kumpulan Bachu seksyen Bioclastic batu kapur dan seksyen takungan batu pasir Donghe pada lapangan T kawasan H bahawa ketepatan memuaskan boleh dicapai pada kedua-dua batu klastik dan formasi karbonat serta kelebihan yang ketara terungkap apabila berurusan dengan formasi yang kompleks, justeru menunjukkan prospek aplikasi yang baik dan memberikan cara baru untuk menyelesaikan masalah yang kompleks dalam bidang penerokaan lapangan minyak dan pembangunan dengan teori kabur.

 

Kata kunci: Fungsi keahlian multivariat; pengelogan tafsiran; pengenalan litologi; teori kabur

 

 

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*Corresponding author; email: zhaojun_70@126.com