BULLETIN OF THE GEOLOGICAL SOCIETY OF MALAYSIA SPECIAL ISSUE ON PETROLEUM GEOLOGY VOL. II KANDUNGAN (CONTENTS)

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1 - PP 174/12/86 ISSN ~(UJl~u~~ ~~~~~U(UJ~~ ~~ ~ ~~ ~~~~ll~~~ BULLETIN OF THE GEOLOGICAL SOCIETY OF MALAYSIA SPECIAL ISSUE ON PETROLEUM GEOLOGY VOL. II KANDUNGAN (CONTENTS) 1 Seismic stratigraphic interpretation for the thin layers: case studies Kuo- An Lin, Shi- Chu Fuh & Hsiung-Mao Chen 23 Interactive interpretation of 20 seismic data Ali stair Brown 37 The Dipmeter Advisor - A dipmeter interpretation workstation Gordy G. Shanor 55 The nature and significance of regional unconformities in the hydrocarbon-bearing Neogene sequence offshore West Sabah B.K. Levell 91 Palaeo bath ymetrica I changes in NW Sarawak during the Oligocene to Pliocene Hans Hageman 103 Computer-assisted interpretation of depositional palaeoenvironments based on foraminifera Philip Lesslar 121 Marine statics Chiem Boon Hong 133 Tinggi field - analyzing the DHIs Harun Mohd. Noor 151 Use of SEISLOG for basin evaluation and field development R.C. Mummery 177 Trap styles of the Tenggol Arch and the southern part of the Malay Basin Ng Tong San 195 Depositional controls of reservoir thickness and quality distribution in Upper Miocene shallow marine sandstones (Stage IVD) of the Erb West Field, Offshore Sa bah, NW Borneo H.D. Johnson, S. Levell & A.H. Mohamad 231 Derivation of seismic depth sections H. Buchholtz & W. Houba 251 Superimposed deformations and vergence of lower Tertiary sediments near Tatau, Sarawak H.D. Tija, Borhan Sidi & Teoh Chuen Lye Editor G.H. T EH DECEMBER 1987

2 PERSATUAN GEOLOGI MALAYSIA (GEOLOGICAL SOCIETY OF MALAYSIA) The Society was founded in 1967 with the aim of promoting the advancement of earth sciences particularly of the Southeast Asian region. Majlis (Council) 1987/88 President (President) Naib Presiden (Vice-President) Setiausaha Kehormat (Hon. Secretary) Penolong Setiausaha Kehormat (Asst. Hon. Secretary) Bendahari (Treasurer) Pengarang (Editor) Presiden Yang Dahulu (Immediate Past President) Hamzah Mohamad Ahmad Said S. Paramananthan Ibrahim Komoo Ahmad Tajuddin TehGuanHoe John Kuna Raj Ahli-ahli Majlis (Councillors) : Albert Loh Azhar Hussin Chin Lik Suan Tai Say Ann : Fateh Chand Idris Mohamad Khee Kok Kean Wan Fuad Wan Hassan Lembaga Penasihat Pengarang (Editorial Advisory Board) Aw Peck Chin Azhar Hj. Hussin K.R. Chakraborty Cheang Kok Keong Chong Foo Shin Choo Mun Keong Chu Leng Heng Denis Tan K.F.G. Hosking C.S. Hutchison Ian Metcalfe John Kunaraj Leong Lap Sau S. Paramananthan Senathi Rajah Shu Yoon Khoon P.H. Stauffer Tan Boon Kong Tan Tiong Hing T.D. Tjia Wong Chow Bin Yeap Cheng Hock Yeow Yew Heng Yin Ee Heng About the Society The Society has a membership of about 600 earth scientists interested in Malaysia and other Southeast Asian regions. The membership is worldwide in distribution. For enquiries about the Society, e.g. membership, annual dues and publications, please write to: The Hon. Secretary, GEOLOGICAL SOCIETY OF MALAYSIA c/o Dept. of Geology, University of Malaya, Kuala Lumpur, MALAYSIA.

3 PP 174/12/86 ISSN ~(UJ[L~lFmNl ~~~1F~[Nl ~~ ~ ~~ llil~~~~~~~ BULLETIN OF THE GEOLOGICAL SOCIETY OF MALAYSIA SPECIAL ISSUE ON PETROLEUM GEOLOGY VOL. II KANDUNGAN (CONTENTS) 1 Seismic stratigraphic interpretation for the thin layers: case studies Kuo--An Lin, Shi-Chu Fuh & Hsiung-Mao Chen. 23 Interactive interpretation of 2D seismic data Alistair Brown 37 The Dipmeter Advisor - A dipmeter interpretation workstation Gordy G. Shanor 55 The nature and significance of regional unconformities in the hydrocarbon-bearing Neogene sequence offshore West Sabah B.K. Levell 91 Palaeobathymetrical changes in NW Sarawak during the Oligocene to Pliocene Hans Hageman 103 Computer-assisted interpretation of depositional palaeoenvironments based on foraminifera Philip Lesslar 121 Marine statics Chiem Boon Hong 133 Tinggi field - analyzing the OHIs Harun Mohd. Noor 151 Use of SEISLOG for basin evaluation and field development R.C. Mummery 177 Trap styles of the Tenggol Arch and the southern part of the Malay Basin Ng Tong San 195 Depositional controls of reservoir thickness and quality distribution in Upper Miocene shallow marine sandstones (Stage IVD) of the Erb West Field, Offshore Sabah, NW Borneo H.D. Johnson, S. Levell & A.H. Mohamad 231 Derivation of seismic depth sections H. Buchholtz & W. Houba 251 Superimposed deformations and vergence of lower Tertiary sediments near Tatau, Sarawak H.D. Tija, Borhan Sidi & Teoh Chuen Lye Editor G.H.TEIl DECEMBER 1987

4 Published in December 1987 by the GEOLOGICAL SOCIETY OF MALAYSIA KUALA LlIMPUR This Special Pu~lication is financed by the Society's Publication Fund. Printed by Art Printing Works Sdn. Bhd. 29 Jalan Riong Kuala Lumpur

5 Pendahuluan Dengan kejayaan Buletin Khusus Geologi Petroleum Pertama yang dikeluarkan pada November 1985 serta penerimaan 13 kertas daripada Seminar Geologi P!'!troleum 1985, Persatuan akan mencapai matlamatnya mengeluarkan satu Buletin Khusus Geologi Petroleum tiap-tiap tahun sempena Seminar Geologi Petroleum Tahunan. Penyediaan Buletin Khusus Geologi Petroleum ini dicapai oleh kerjasama penulispenulis yang telah menyediakan manuskrip-manuskrip mereka untuk penerbitan di sini walaupun mereka mempunyai beban-kerja yang berat. Diharap bahawa Keluaran-keluaran Khusus Geologi Petroleum ini dapat memperbetulkan kekurangan rujukan geologi tentang kawasan luar pantai Semenanjung Malaysia, Sabah dan Sarawak. Maklumat ini akan membantu pakar-pakar geologi yang ~edang bekerja di kawasan-kawasan ini memahami serta menerangkan lebih jelas data yang mungkin akan menambah kejayaan menemui medan-medan petroleum dan gas baru. Persatuan mengucapkan terima kasih kepada kesemua syarikat-syarikat petroleum dan servis, universiti-universiti tempatan yang telah memberi pekerja-pekerjanya masa serta sokongan menyediakan kertas-kertas mereka. Kerjasama PETRONAS dan pengulas-pengulas juga amat dihargai. Dengan tidak ketinggalan, Persatuan merekodkan ribuan terima kasih kepada semua yang telah memberi sumbangan kewangan kepada Tabung Penerbitan Persatuan dan pengurusan Seminar Geologi Petroleum Tahunan. Preface Due to the highly successful first Special Bulletin on Petroleum Geology in November 1985 and the equally encouraging response of 13 papers submitted for publication from the Society's Petroleum Geology Seminar 1985, the Society is well on its way of achieving its aim of bringing out one special Bulletin on Petroleum Geology each year in time for the Society's Annual Petroleum Geology Seminars. The preparation ofthis Special Issue on Petroleum Geology Volume II is made possible through the sacrifice of the many authors, who, despite their heavy workload and various other commitments, have managed to prepare their worthy manuscripts for publication here. It is hoped that these Special Issues on Petroleum Geology will help in correcting the dearth of geologic information on offshore Peninsular Malaysia, Sabah and Sarawak and perhaps help geologists working in these regions in the better understanding and interpretation of their data that might lead to further discoveries of oil and gas fields. The Society expresses its gratitude to the various oil companies, service organisations and universities for allowing their personnel concerned the time and support to prepare their papers and also to PETRONAS for the excellent cooperation and the release of papers that required their approval. The prompt reviews by those concerned are also greatly appreciated. In addition, the Society records its thanks to the many donors for their valuable financial contributions to the Society's Publication Fund and the running of the Annual Petroleum Geology Seminars. G.H. Teh Pengarang/Editor

6 Glossary Bukit. Bt. hill Genting Gtg.. pass Gunung G. mountain Jalan Jln. road, street Kampung Kg. village Kuala K. mouth of river Permatang Ptg. sandy ridge along coast Pulau P. island Sungai S. river Tanjung Tg. cape Teluk T. bay Barat Barat daya Barat laut Batu Batuan Besar Kedl Laut Selat Selatan Semenanjung Tasik Tenggara Timur Timur.laut Utara.. west southwest northwest stone rock large small sea strait south peninsula lake southeast east northeast north