石油与天然气地质 ›› 1993, Vol. 14 ›› Issue (1): 14-22.doi: 10.11743/ogg19930103

• 论文 • 上一篇    下一篇

东淮凹陷低渗致密砂岩成因与深层气勘探

袁政文   

  1. 中原油田勘探开发研究院 河南 濮阳457001
  • 收稿日期:1990-09-04 修回日期:1992-10-10 出版日期:1993-03-25 发布日期:2012-01-16

ORIGIN OF LOWER PERMEABILITY TIGHT-SANDSTONFS AND GAS EXPLORATION IN DEEP BEDS OF DONGPU DEPRESSION

Yuan Zhengwen   

  1. Research Institute of Petroleum Exploration and Development, Zhongyuan Oilfield
  • Received:1990-09-04 Revised:1992-10-10 Online:1993-03-25 Published:2012-01-16

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摘要：

东濮凹陷深层天然气储层为深水湖底扇沉积。在埋藏成岩作用过程中经历了异常高压条件下的成岩变化,由于上覆封隔层的屏蔽作用,溶蚀的物质不易迁出,来自泥岩粘土矿物演化析出的Si4+、Fe2+、Ca2+、Mg2+等离子,就近发生了强烈的含铁碳酸盐沉淀、交代作用和石英的次生加大作用。砂岩的孔、渗率急剧降低,粒间、粒内溶孔和微孔隙成为深层天然气聚集的主要储集空间。这类储气层具有(1)高毛细管压力,(2)高含水饱和度,(3)高压力敏感性和(4)高的非均质性。必须加强地质、地球物理和钻、完井工艺的系统研究,方能提高勘探的成功率。

关键词: 东濮凹陷, 深层气, 成岩作用, 致密砂岩

Abstract:

The gas reservoirs of deep beds in Dongpu Depression are considered to be sublacus-trine fan which underwent diagenetic changes under abnormal high pressure condition.Because of the shielding of the overlying sealed beds,the separated materials includingS4+,Fe2+,Ca2+ and Mg2+ etc.ions contained in mudstone clay minerals were not easyto move out,thus causing intensely ferrian carbonate-precipitation,replacement,quartzsecondary enlargement nearby.The permeability of sandstone dropped rapidly,so inter-granular pores, intragranular pores and micropores became the main preserving spaces ofthe reservoirs,and hence the reservoirs characterized by 1.high capillary-pressure;2.highaquifer-satuation;3.high pressure-sensitivity and 4.high heterogeneity.It is suggestedthat a systematic study including geological and geophysical researches,the techniques ofwell-drilling and well-completion should be carried out to improve the success of gas exploration.