CAJ | 학술논문

在对烃源岩和储层基本特征分析的基础上，采用生烃潜力法恢复了烃源岩的排烃历史，并从数值模拟的角度研究了储层孔隙度的演化历史。结果表明，渤海湾盆地南堡凹陷沙河街组三段具有良好的致密砂岩气成藏地质条件：中等－好的供气源岩和广泛分布的致密储层，烃源岩与致密储层紧密相邻，天然气成藏时间和储层致密时间配置较好。烃源岩的排气高峰时间是在馆陶期到明化镇早期，储层致密的时间是馆陶末期到明化镇早期。在生烃增压造成的气体膨胀力作用之下，天然气可近源聚集在紧邻烃源岩分布的致密透镜状岩性砂体中，形成连续型致密砂岩气藏。
재대경원암화저층기본특정분석적기출상，채용생경잠역법회복료경원암적배경역사，병종수치모의적각도연구료저층공극도적연화역사。결과표명，발해만분지남보요함사하가조삼단구유량호적치밀사암기성장지질조건：중등－호적공기원암화엄범분포적치밀저층，경원암여치밀저층긴밀상린，천연기성장시간화저층치밀시간배치교호。경원암적배기고봉시간시재관도기도명화진조기，저층치밀적시간시관도말기도명화진조기。재생경증압조성적기체팽창력작용지하，천연기가근원취집재긴린경원암분포적치밀투경상암성사체중，형성련속형치밀사암기장。
Based on analyses of the source rocks and reservoirs in the E s3(the 3rd member of Shahejie Fm),the hydrocar-bon expulsion history was restored with the hydrocarbon generation potential method ,and evolution history of reservoir po-rosity was established through numerical modeling .The results show that accumulation conditions of tight sand gas in the Es3 in the Nanpu Sag of the Bohai Bay Basin are pretty good: fair-good source rocks and widespread reservoirs were closely connected with each other , and the timing of gas accumulation and reservoir tightening was favorable .The peak gas expulsion occurred from the Guantao to early Minghuazhen ,while the reservoir tightening was from the late Guantao to early Minghuazhen .These gases might accumulate in the lenticular sand body near the source rocks under the force of gas expansion ,forming continuous tight sand gas reservoirs .