| PDF: | |
| Time: | 2016 |
| Journal: | OIL & GAS GEOLOGY |
| Volumn: | 37 |
| Issue: | 3 |
| Pages: | 373-380 |
| Type: | EI |
| Author: | Sun Ang,Huang Yulong,Li Jun,Feng Yuhui,Wang Jianfei,Wang Pujun |
Abstract: | Based on 3555m logging segment and core & debris of diabase from 41 wells and 560km2 3D seismic data. Through identification of 86 rock slices, establish the geological properties-logging / seismic response relationship, study diabase lithology, facies and logging recognition feature of diabase of Eastern Sag, Liaohe Basin, achieve well constraints - seismic mapping, explore the spatial distribution and accumulation regularity of diabase. Diabase is wholly crystalline with porphyric-like texture, phenocrysts are plagioclase and clinopyroxene, effective reservoir space are mainly secondary dissolved pores and fractures. Diabase could be divided into two sub-facies: centrality and border, favorable reservoir is inclined to be distributed in border sub-facies. Characteristic of logging of diabase is high resistivity and low acoustic time whose shape of curve is smooth or slight sawtooth, and characteristic of seismic of diabase is high amplitude, middle - low frequency and fine continuity of phase axis. Vertically, diabase is distributed in Formation Shahejie Member Ⅲ and Formation Shahejie MemberⅠ, and there are two kind of original occurrence of invasion: layer - parallel and layer- transgress, and two kind of transformed occurrence of invasion: saucer - shaped and fault - block. Distribution of diabase is controlled by the main strike - slip fault (Jiazhangsi fault and Jiadong fault), and there are two intrusive manners associated with fault: unilateral invasion and bilateral invasion. The distance of invasion is 1375m to 5625m (average: 2572m ) , thickness of the intrusions is 49m to 165m(average: 112m). Generally, the larger volume of diabase, the larger thickness of overlying strata.The intrusive age of diabase is late Dongying period. The diabase is product of volcano - hydrothermal effects. Secondary pore causing by fluid - rock interaction is a critical factor for formation of diabase reservoir. “Interface reservoir” is mainly regularity of oil & gas pool formation of diabase. |