| PDF: | |
| Time: | 2008 |
| Journal: | Acta Petrolei Sinica |
| Volumn: | 29 |
| Issue: | 6 |
| Pages: | 841-845 |
| Type: | EI |
| Author: | Huafeng Tang,Yanming Pang,Weihua Bian,Pujun Wang,Feiqiong Min |
Abstract: | According to occurrence, lithological association of volcanic rocks and volcanic facies composition in the Early Cretaceous Yingcheng Formation of Songliao Basin, the volcanic edifice was classified into three kinds of cracter -near cracter facies belt, proxi-mal facies belt and distal facies belt.The reservoirs characteristics in each facies belt of volcanic edifice were analyzed using the parameters of porosity , permeability and mercury -injection capillary pressure curve from 304 drilling samples.The reservoir in the crater -near crater facies belt is characterized by big pore, wide and long fracture, big pore-throat radius and pore-throat well -sorted. The measured porosity ranges from 2% to 25%, and the average value is 7 .74%.The range of permeability is from 0.01×10-3μm2 to 100×10-3μm2,and the average value is 1.99×10-3μm2.In the crater -near crater facies belts, most reservoir is charaterized by middle porosity and high permeability , the local parts are the reservoir with high porosity and high permeability.The reservoir in the proximity facies belt is of the properties of middle pore, narrow and small crack, middle pore-throat radius and pore-throat slightly well-sorted.The range of porosity is from 1% to 15%, and the average value is 7 .47 %.The range of permeability is from 0.01×10 -3 μm2 to 20×10-3μm2 , and the average value is 0.95×10-3μm2.The proximal facies belt mostly is the reservoir with middle porosity and permeability . Some part of the belt is the reservoir with middle porosity and high permeability.The distal facies belt is the reservoir with middle -small pore, wide and long crack, small pore-throat radius and pore-throat bad -sorted.The range of porosity is from 1% to 10%, and the average value is 6 .95%. The range of permeability is from 0. 02×10-3μm2 to 1.0×10-3μm2, and the average value is 0 . 13×10 -3 μ m 2 .The distal facies belt is the reservoir with middle -small porosity and low permeability .The crater-near crater facies belt is the preferable target for volcanic reservoir exploration. |