石油学报 ›› 2015, Vol. 36 ›› Issue (11): 1349-1357.DOI: 10.7623/syxb201511004

• 地质勘探 • 上一篇    下一篇

连续型油气藏聚集与形成机理——以渤南洼陷中心区沙河街组四段上亚段为例

程付启1, 宋国奇2, 刘雅利2, 金强1, 孙菲菲3   

  1. 1. 中国石油大学地球科学与技术学院 山东青岛 266580;
    2. 中国石油化工股份有限公司胜利油田分公司 山东东营 257001;
    3. 中国石油华北油田公司勘探开发研究院生油实验室 河北任丘 062552
  • 收稿日期:2015-05-10 修回日期:2015-09-01 出版日期:2015-11-25 发布日期:2015-12-05
  • 通讯作者: 程付启,男,1978年10月生,2002年获石油大学(华东)学士学位,2007年获中国石油大学(华东)博士学位,现为中国石油大学(华东)地球科学与技术学院副教授,主要从事油气地质与地球化学研究。Email:chengfq9804@163.com
  • 作者简介:程付启,男,1978年10月生,2002年获石油大学(华东)学士学位,2007年获中国石油大学(华东)博士学位,现为中国石油大学(华东)地球科学与技术学院副教授,主要从事油气地质与地球化学研究。Email:chengfq9804@163.com
  • 基金资助:

    国家重大科技专项(2011ZX05006-003)和中央高校基本科研业务费专项资金项目(15CX02003A)资助。

Accumulation and formation mechanism of continuous hydrocarbon reservoirs:a case study of Upper Member 4 of Shahejie Formation,central Bonan sub-sag

Cheng Fuqi1, Song Guoqi2, Liu Yali2, Jin Qiang1, Sun Feifei3   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Sinopec Shengli Oilfield Company, Shandong Dongying 257001, China;
    3. Organic Geochemistry Laboratory, Research Institute of Petroleum Exploration & Development, PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China
  • Received:2015-05-10 Revised:2015-09-01 Online:2015-11-25 Published:2015-12-05

摘要:

为了研究渤南洼陷中心区沙河街组四段上亚段(沙四上亚段)是常规隐蔽油气藏、还是非常规连续型油气藏的问题,对其油藏特征进行了系统分析,并与国内外连续型油气藏进行了对比。研究发现,渤南洼陷中心区沙四上亚段油气藏无底水、气-油倒置、储层致密(孔隙度为2%~10%、渗透率为0~1.0 mD)、地层压力高(压力系数可达1.6)且紧邻沙河街组三段下亚段、沙河街组四段上亚段烃源岩,具备连续型油气藏的特征及形成条件,为连续型油气藏。分析认为,连续型油气藏的形成,不仅需要异常高的生烃压力排驱油气完成初次运移,还需要在高压驱动下在储层中进行二次运移,而储层内的高压来自生烃压力的传递作用。因此,连续型油气藏的形成过程即是伴随油气充注、源-储压力趋于平衡的过程。成藏动-阻力分析认为,连续型油气藏形成的前提是源岩生烃压力超过储层中值压力,据此推导了连续型油藏形成的孔隙度下限计算公式,并计算了30多口探井的孔隙度下限值。计算结果显示,在生烃压力最大的深洼区,储层孔隙度大于4%即可成藏,与目前勘探揭示的情况一致。

关键词: 连续型油气藏, 成藏过程, 物性下限, 渤南洼陷, 沙四上亚段

Abstract:

To study whether the Upper Member 4 of Shahejie Formation in central Bonan sub-sag is conventional subtle reservoir or unconventional continuous hydrocarbon reservoirs, its accumulation characteristics have been systemically studied and compared with domestic and overseas continuous reservoirs. Research results show that hydrocarbon reservoirs in the Upper Member 4 of Shahejie Formation of central Bonan sub-sag are characterized by no bottom water, gas-oil inversion, tight reservoirs (the porosity and permeability are 2% -10% and 0-1.0 mD respectively), high formation pressure (pressure coefficient is up to 1.6), adjacent to the source rocks of Lower Member 3 and Upper Member 4 of Shahejie Formation, and endowed with the features and formation conditions of continuous hydrocarbon reservoirs. Therefore, the formation of continuous hydrocarbon reservoirs not only needs abnormally high hydrocarbon generation pressure for oil and gas flooding to complete the first migration, but also requires the second migration in reservoirs forced by high pressure, and the high pressure in reservoirs is sourced from the transfer of hydrocarbon generation pressure. Hence, the formation of continuous hydrocarbon reservoirs is a process accompanied by hydrocarbon charging and source-reservoir pressure tending to be equilibrium. The accumulation dynamic-resistance analysis indicates that the continuous hydrocarbon reservoirs are formed under the premise that source-rock hydrocarbon generation pressure is exceeding reservoir median pressure. Accordingly, the calculation equation of porosity lower limit for continuous hydrocarbon reservoirs was derived and applied to more than 30 exploratory wells. The calculation results show that in the deep sag with maximum hydrocarbon generation pressure, reservoirs can be formed when the porosity is greater than 4%, consistent with the situation in current exploration.

Key words: continuous hydrocarbon reservoirs, accumulation process, lower limit of physical property, Bonan sub-sag, the Upper Member 4 of Shahejie Formation

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