drilling results 2007 2009 in the western black sea targeted on neogene deep and shallow water...

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1 18th International Petroleum and Natural Gas Congress and Exhibition of Turkey, IPETGAS 2011 May 11th -13th, 2011. 2007-2009 YILLARI ARASINDA BATI KARADENİZ' DE NEOJEN YAŞLI SIĞ VE DERİN HEDEFLİ SEDİMANLARIN SONDAJ SONUÇLARI Drilling Results 2007 - 2009 in the Western Black Sea Targeted on Neogene Deep and Shallow Water Sediments Atila Sefünç, Alastair Gray, Hüseyin Yıldırım Tiway Turkey Limited.Ankara-Turkey ABSTRACT Prior to 2007 the only drilling in the West Balck sea ( west of Istanbu) were the Karadeniz-1(1970), Igneada-1(1971), and Limankoy 1 and 2 (1999). The resuslts of all of these wells were negative . Despite this, during the period 2006 to 2009 Toreador Turkey embarked upon an exploration campaign in the western Black Sea. Well Karaburun-1(2007) was located adjacent to the Kırklareli area to the Southwest of the previously drilled wells İgneada-1 and Karadeniz-1, The Karaburun-1 well location was defined by seismic surveys conducted during 2007. Karaburun targeted a basement high structure thought to be overlain by Sogucak reefal carbonates. This premise was found to be false and the well finished in volcanics of Yemislicay with no resrvoir potential being encountered. Durusu-1 well was identified by a 1500 km 2D marine seismic survey which was acquired in 2006. Tertiary sediments cover the basement rocks of Istrandja Massif and the Paleozoic istanbul Unit in Thrace Area. Basement rocks are overlain by different stratigraphic units from Early Middle Eocene to Miocene Pliocene rock associations. The main and secondary aims of Durusu-1 were to test the hydrocarbon possibilities of the Middle-Late Oligocene aged deltaic Osmancık Sandstones and Late Oligocene-Early Miocene aged Danismen deltaic sandstones. The Osmancık Sandstones together with Ergene and Danismen Sandstones were encountered in Durusu-1 at the expected depths. No DST’s were performed. No

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Page 1: Drilling results 2007   2009 in the western black sea targeted on neogene deep and shallow water sediments ipetgas-2011

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18th International Petroleum and Natural Gas Congress and Exhibition of

Turkey, IPETGAS 2011 May 11th -13th, 2011.

2007-2009 YILLARI ARASINDA BATI KARADENİZ' DE NEOJEN YAŞLI SIĞ VE

DERİN HEDEFLİ SEDİMANLARIN SONDAJ SONUÇLARI

Drilling Results 2007 - 2009 in the Western Black Sea Targeted on Neogene Deep

and Shallow Water Sediments

Atila Sefünç, Alastair Gray, Hüseyin Yıldırım

Tiway Turkey Limited.Ankara-Turkey

ABSTRACT

Prior to 2007 the only drilling in the West Balck sea ( west of Istanbu) were the

Karadeniz-1(1970), Igneada-1(1971), and Limankoy 1 and 2 (1999). The resuslts of

all of these wells were negative .

Despite this, during the period 2006 to 2009 Toreador Turkey embarked upon

an exploration campaign in the western Black Sea. Well Karaburun-1(2007) was

located adjacent to the Kırklareli area to the Southwest of the previously drilled wells

İgneada-1 and Karadeniz-1, The Karaburun-1 well location was defined by seismic

surveys conducted during 2007. Karaburun targeted a basement high structure

thought to be overlain by Sogucak reefal carbonates. This premise was found to be

false and the well finished in volcanics of Yemislicay with no resrvoir potential being

encountered.

Durusu-1 well was identified by a 1500 km 2D marine seismic survey which

was acquired in 2006. Tertiary sediments cover the basement rocks of Istrandja

Massif and the Paleozoic istanbul Unit in Thrace Area. Basement rocks are overlain

by different stratigraphic units from Early – Middle Eocene to Miocene – Pliocene

rock associations. The main and secondary aims of Durusu-1 were to test the

hydrocarbon possibilities of the Middle-Late Oligocene aged deltaic Osmancık

Sandstones and Late Oligocene-Early Miocene aged Danismen deltaic sandstones.

The Osmancık Sandstones together with Ergene and Danismen Sandstones were

encountered in Durusu-1 at the expected depths. No DST’s were performed. No

Page 2: Drilling results 2007   2009 in the western black sea targeted on neogene deep and shallow water sediments ipetgas-2011

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core was taken in the well. Drilling was continued down to 2510 m and Durusu-1

exploration well was completed as a dry well on 27.08.2009.

Structural and stratigraphic evaluations of 2D seismic data laid the ground for

a consistent regional framework. Seismic attributes and sequence stratigraphy

indicated that the main Osmancik reservoir interval is part of a large lowstand

submarine fan system. Analogies with recent successes in West Africa were noted.

The well results are thought to confirm the sedimentological model but unfortunately

a source and migration combination were missing.

Page 3: Drilling results 2007   2009 in the western black sea targeted on neogene deep and shallow water sediments ipetgas-2011

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ÖZET

2007 yılından önce Batı karadenizde (İstanbulun batısı) açılmış olan,

Karadeniz-1(1970), İğneada-1(1971), ve Limanköy 1, ve 2 (1999) kuyularında

hidrokarbon açısından ekonomik bir keşif yapılamamıştır.

Yukarıda açılan kuyulara rağmen, Toreador Şirketi tarafından 2006-2009

yılları arasında Batı Karadeniz'de arama faaliyetleri yapılmıştır. Karaburun-1 (2007)

kuyusu, Kırklareli İli'ne yakın, daha önceden açılmış olan İğneada-1 ve Karadeniz-1

kuyularının güneybatısında yer alır ve kuyu lokasyonu, 2007 yılında yapılan sismik

çalışmalara göre belirlenmiştir (şekil-1).

Şekil-1 Kuzey Trakya jeoloji ve Batı karadenizde açılan kuyuları gösteren

lokasyon haritası

Karaburun-1 kuyusunda düşünülen hedef, temel yükselimi üzerine

uyumsuzlukla oturmuş olan Sogucak resifal karbonatları idi. Ancak hedeflenen

rezervuar yerine kuyu Yemişliçay volkanikleri içinde kalmıştır (Şekil-2).

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Şekil-2 Karaburun-1 kuyusu lokasyon haritası

Durusu-1 kuyusu 2006 yılında gerçekleştirilen 1500 km. iki boyutlu deniz

sismik çalışmaları sonucunda belirlenmiştir. Tersiyer çökelleri Trakya bölgesinde

Istıranca Masifi ve İstanbul Paleozoyik birimlerini kapsar.

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Şekil-3 Durusu-1 kuyusu lokasyon haritası

Trakya da temel, Erken-Orta Eosen ve Miyosen stratigrafik birimler tarafından

örtülmektedir. Durusu-1 kuyusundaki birincil ve ikincil olarak hedeflenen Orta-Geç

Oligosen yaşlı deltaik Osmancık kumtaşları ile Üst Oligosen-Erken Miosen yaşlı

Danışmen deltaik kumtaşları ve Ergene kumtaşlarına beklenen derinliklerde

rastlanılmıştır. Kuyuda DST ve karot alımı yapılmamıştır. Sondaj olarak 2510 m ye

kadar devam edilmiş ve 27.08.2009 tarihinde kuru kuyu olarak terk edilmiştir.

İki boyutlu sismik verilerin yapısal ve stratigrafik değerlendirmeleri, tutarlı

bölgesel çalışmalara zemin oluşturmuştur (Şekil-4).

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Şekil-4 Karaburun-1 ve Durusu-1 kuyularından geçen yığma (F.Stack) sismik

kesiti.

Sismik nitelikler ve sekans stratigrafisi çalışmaları Osmancık rezervuar

formasyonunun lowstand denizaltı yelpaze sisteminin bir parçası olduğunu ortaya

koymuştur. Buradaki bilgiler, Batı Afrika'da başarılı olmuş çalışmalar ile

karşılaştırılarak yorumlanmıştır. Kuyu sonuçlarına göre sedimantolojik modelin

başarılı şekilde uyumlu çıkmasına karşın bölgesel anlamda maalesef kaynak kaya ve

göç sorunun oldugu düşünülmektedir.