石油实验地质
石油實驗地質
석유실험지질
EXPERIMENTAL PETROLEUM GEOLOGY
2014年
3期
325-331
,共7页
含气饱和度%致密气%渗透率%孔二段%潍北凹陷%渤海湾盆地
含氣飽和度%緻密氣%滲透率%孔二段%濰北凹陷%渤海灣盆地
함기포화도%치밀기%삼투솔%공이단%유북요함%발해만분지
gas saturation%tight gas%permeability%2nd member of Kongdian Formation%Weibei Sag%Bohai Bay Basin
潍北凹陷北部洼陷带具有形成致密气藏的良好地质条件，在孔二段形成自生自储自盖组合，埋深大于3500 m均为致密气藏发育区。通过分析孔隙尺度下的天然气运移模式、模拟实验确定含气饱和度影响因素，建立了渗透率与最终含气饱和度相关关系，相关系数为0．904，实验结果表明充注时间较早，气藏形成期存在异常高压。流体包裹体均一温度表明深层致密气藏经历了2期充注，第一期发生在沙河街组沉积早期（52～50．5 Ma），第二期发生在沙河街构造运动之前（43．5～36 Ma），以第二期充注为主。沙河街构造运动造成盆地泻压，致密气藏被破坏。新近系的沉积使储层进一步致密化，有利于孔店组致密气的保存。因此，潍北凹陷深层孔店组致密气为残留气藏，仍有一定的勘探前景。
濰北凹陷北部窪陷帶具有形成緻密氣藏的良好地質條件，在孔二段形成自生自儲自蓋組閤，埋深大于3500 m均為緻密氣藏髮育區。通過分析孔隙呎度下的天然氣運移模式、模擬實驗確定含氣飽和度影響因素，建立瞭滲透率與最終含氣飽和度相關關繫，相關繫數為0．904，實驗結果錶明充註時間較早，氣藏形成期存在異常高壓。流體包裹體均一溫度錶明深層緻密氣藏經歷瞭2期充註，第一期髮生在沙河街組沉積早期（52～50．5 Ma），第二期髮生在沙河街構造運動之前（43．5～36 Ma），以第二期充註為主。沙河街構造運動造成盆地瀉壓，緻密氣藏被破壞。新近繫的沉積使儲層進一步緻密化，有利于孔店組緻密氣的保存。因此，濰北凹陷深層孔店組緻密氣為殘留氣藏，仍有一定的勘探前景。
유북요함북부와함대구유형성치밀기장적량호지질조건，재공이단형성자생자저자개조합，매심대우3500 m균위치밀기장발육구。통과분석공극척도하적천연기운이모식、모의실험학정함기포화도영향인소，건립료삼투솔여최종함기포화도상관관계，상관계수위0．904，실험결과표명충주시간교조，기장형성기존재이상고압。류체포과체균일온도표명심층치밀기장경력료2기충주，제일기발생재사하가조침적조기（52～50．5 Ma），제이기발생재사하가구조운동지전（43．5～36 Ma），이제이기충주위주。사하가구조운동조성분지사압，치밀기장피파배。신근계적침적사저층진일보치밀화，유리우공점조치밀기적보존。인차，유북요함심층공점조치밀기위잔류기장，잉유일정적감탐전경。
There were good geological conditions for tight gas reservoirs in the northern subsag of the Weibei Sag, forming the combination of self-generation, self-storage and self-cover in the 2nd member of the Kongdian Formation . Tight gas reservoirs generated in the area deeper than 3 500 m. The natural gas migration patterns under different porosity conditions were analyzed, and the influencing factors for gas saturation were studied with exper-iments. The relationship between permeability and final gas saturation was defined, and the coefficient was 0.904. Experimental results showed that gas charged early and abnormal high pressure existed during gas accumulation stage. The homogenization temperature of fluid inclusions showed that tight gas reservoirs experienced 2 charging periods. The 1st period was the early Shahejie period (52-50.5 Ma) and the 2nd one was before the Shahejie structural movement (43.5-36Ma), among which the 2nd period played a more important role. The Shahejie structural movement caused pressure reducing and tight gas reservoirs were destroyed. The deposition of Neogene made reservoirs further compact, which was favorable for tight gas reservoir preservation in the Kongdian Forma-tion. The tight gas reservoirs of the Kongdian Formation in the Weibei Sag were residual gas reservoirs, and still had good exploration prospects.
