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
Diserahkan: 17
Februari 2017/Diterima: 31 Mei 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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*Pengarang untuk surat-menyurat;
email: zhaojun_70@126.com