天然气地球科学

• 天然气地质学 • 上一篇    下一篇

塔西南坳陷麦盖提斜坡奥陶系油气成藏特征

崔海峰,田雷,张年春,刘军   

  1. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020
  • 收稿日期:2015-05-04 修回日期:2015-11-20 出版日期:2016-01-10 发布日期:2016-01-10
  • 作者简介:崔海峰(1976-),男,陕西韩城人,高级工程师,博士,主要从事构造地质和油气成藏研究. E-mail:cuihf@petrochina.com.cn.
  • 基金资助:

    中国石油天然气股份有限公司重大科技专项(编号:041012120005)资助.

Ordovician reservoir accumulation characteristics in the Maigaiti slope of the Southwest Depression,Tarim Basin

Cui Hai-feng,Tian Lei,Zhang Nian-chun,Liu Jun   

  1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China
  • Received:2015-05-04 Revised:2015-11-20 Online:2016-01-10 Published:2016-01-10

摘要:

明确麦盖提斜坡奥陶系油气成藏模式是认识奥陶系油气分布规律的关键。从奥陶系失利钻井分析入手,结合区域构造演化特征,认为塔里木盆地麦盖提斜坡奥陶系油气成藏与塔北、塔中隆起奥陶系相比较,有相似性,但更多地是差异性。麦盖提斜坡以台地低能相带沉积为主的鹰山组风化壳岩溶储层整体欠发育,断裂带上岩溶储层的物性也明显差于塔北、塔中隆起台缘相带和台内高能相带;麦盖提斜坡奥陶系由北倾向南倾“跷跷板”式的构造演化过程明显不同于塔北、塔中继承性古隆起,调整迁移型古隆起不利于油气运聚与保存;麦盖提斜坡奥陶系远离满加尔生烃凹陷,而塔北、塔中隆起分布于生烃凹陷两侧。麦盖提斜坡奥陶系油气成藏主要有2个层系:鹰山组上段灰岩风化壳油气藏主要分布在断裂带,鹰山组下段内幕白云岩油气藏则区域稳定分布。麦盖提斜坡原地发育寒武系烃源岩,油气输导以垂向为主;奥陶系构造调整的枢纽带有利于次生油气富集保存。

关键词: 麦盖提斜坡, 奥陶系, 灰岩风化壳, 内幕白云岩, 成藏模式

Abstract:

The confirmation of the Ordovician reservoir accumulation model is the key factor to recognize the distribution rule of Ordovician reservoir in the Maigaiti slope. Analyzed from failed well of Ordovician,and combined with areal structural evolution characters,it is considered that Ordovician reservoir accumulation of Maigaiti slope and the northern,middle of Tarim Basin has a certain similarity,has more differences. The weathering crust karst reservoirs of the Yingshan Formation which mainly belongs to platform low energy facies are not well developed;the tectonic evolution process of ‘north to south migration’ of Ordovician in the Maigaiti slope differed from the inherited palaeohigh of the northern,middle of Tarim Basin,the adjusting-migration type of the palaeohigh is not favoured of migration,accumulation and preservation of oil and gas. The Maigaiti slope is far away from the hydrocarbon generation sag of the Maijiaer,while the northern,middle uplift of Tarim Basin is around the sag. The study indicates that there are two main layers in Ordovician for oil-gas accumulation:the oil-gas pool of the Upper Yingshan Formation which develops limestone crust reservoir and mainly distributes in the fracture belt,and that of the Lower Yingshan Formation which develops inside dolomite rock reservoir and stably distributes in this area,too. Autochthonous source rock of Cambrian develops in the Maigaiti slope,and vertical migration is the main type for oil-gas accumulation;the hinge belt that developed during the Ordovician structure adjustment is beneficial for rich accumulation of the secondary oil-gas.

Key words: Maigaiti Slope, Ordovician, Limestone crust, Inside dolomite rock, Accumulation model

中图分类号: 

  • TE122.3

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