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Clastic Stratigraphic Traps - What has Driven Exploration Performance?

出版商 Douglas-Westwood 商品編碼 941788
出版日期 內容資訊 英文
商品交期: 最快1-2個工作天內
碎屑地層封閉:是什麼驅動勘探性能? Clastic Stratigraphic Traps - What has Driven Exploration Performance?
出版日期: 2020年02月26日內容資訊: 英文




  • 數據集和調查方法


  • 地理分佈
  • 水庫年齡
  • 層封閉的類型
  • 沉積環境和沈積相
  • 洗手盆類型


  • 長期表現
  • 封閉類型基準
  • 盆地基準
  • 成熟度
  • 按沉積斜坡位置
  • 按地球物理屬性
  • 公司
  • 字段大小分佈


  • 井故障分析
  • 成功率高的盆地
    • 魯武馬盆地成熟
    • 蘇裡南-圭亞那盆地深海
    • 成熟的深海塔諾盆地
    • 新興的科爾維爾盆地
  • 成功率低的盆地
    • 塞拉利昂未開發的利比裡亞盆地
    • 北海中心
    • 成熟的巴西盆地


  • 沉積斜坡上的圈閉封閉位置
  • 有斜率與無斜率
  • 層壓與已經廣泛的層封閉



Report Summary

More oil and gas was discovered in stratigraphic traps than any other trap type in the last decade. Excelling in stratigraphic trap exploration is now key to top quartile exploration performance.

Westwood has analysed 376 exploration wells that tested clastic stratigraphic traps between 2008 and end January 2020 in 66 basins and 113 different plays, to investigate stratigraphic trap exploration performance and understand the key success factors.

A total of 35 bnboe has been discovered in clastic stratigraphic traps since 2008, comprised of 22 bnboe (132 tcf) of gas and 13 bnbbl of oil. 75% of the oil resources and 95% of the gas resources was discovered in deep water.

Stratigraphic traps had a larger average discovery size and a lower drilling finding cost, compared to other traps types in the period. Stratigraphic traps had a commercial success rate in line with other trap types and second only to faulted traps.

The industry is getting better at exploring stratigraphic traps with the CSR for stratigraphic traps increasing in the 2017-2019 period compared to 2014-2016. The more effective use of seismic attributes and better integration with geological models has had an impact in some basins.

Stratigraphic trap exploration has been geographically concentrated along the Atlantic margin, where 43% of the wells were drilled in 29 basins. Another 20% of the wells have been drilled in the North Sea. Only 18 basins globally saw more than 5 stratigraphic traps tested.

The most prolific basins were Suriname-Guyana, the MSGBC, the Rovuma-Rufiji and the Colville, where major new plays dominated by stratigraphic traps emerged in the period. Upper Cretaceous aged stratigraphic traps delivered 42 commercial discoveries, with a total of 9.3 bnbbl of oil and 39 tcf of gas, of which 7.1 bnbbl of the oil is in the Suriname-Guyana basin and 20 tcf is in the MSGBC basin. Oligocene plays delivered 7 commercial discoveries with a total 40 tcf of gas - of which 36 tcf was in the Ruvuma basin in Mozambique.

There were also notable disappointing campaigns targeting stratigraphic traps in the Carnarvon, Sierra Leone-Liberia and Central North Sea basins from which important lessons can be learned.

Marine turbidite sandstones in stratigraphic traps in passive margin settings were the most targeted delivering 90% of discovered commercial resources. Significant discoveries have also been made in stratigraphic traps with deltaic to shallow marine reservoirs and in foreland basins.

For marine turbidite plays, stratigraphic traps on graded slopes in the lower slope to basin floor settings performed best in terms of both discovered volumes and success rates. Finding stacked traps or areally extensive traps was key to commercial success.

Large commercial deep-water standalone discoveries in clastic reservoirs are now most likely to be found in stratigraphic traps and traps with stratigraphic components. Pushing the boundaries of plays further down the slope of passive margins and looking beyond deep-water passive margins may deliver the next wave of stratigraphic trap plays.

Table of Contents


1. Introduction

  • Dataset and methodology

2. Geographic and Geological Context of Stratigraphic Traps

  • 2.1. Geographical distribution
  • 2.2. Reservoir age
  • 2.3. Stratigraphic trap type
  • 2.4. Depositional environments and sedimentary facies
  • 2.5. Basin type

3. Stratigraphic Trap Exploration Benchmarking

  • 3.1. Performance over time
  • 3.2. Trap type benchmarking
  • 3.3. Basin benchmarking
  • 3.4. By play maturity
  • 3.5. By position on the depositional slope
  • 3.6. By geophysical attributes
  • 3.7. By company
  • 3.8. Field size distribution

4. Geological factors influencing performance

  • 4.1. Well failure analysis
  • 4.2. Basins with high success rates
    • Maturing Ruvuma Basin
    • Emerging deepwater Suriname-Guyana Basin
    • Maturing deepwater Tano Basin
    • Emerging Colville Basin
  • 4.3. Basins with low success rates
    • Frontier Sierra Leone-Liberia Basin
    • Mature Central North Sea
    • Mature Carnarvon Basin

5. Geological factors increasing the chance of success

  • Location of stratigraphic traps on the depositional slope:
  • Graded versus ungraded slopes:
  • Stacked versus areally extensive stratigraphic traps:

6. Conclusions

  • References
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  • Disclaimer