松辽盆地长岭断陷东岭地区营城组输导层孔隙演化与油气充注关系

油气的成藏过程是地质历史时期的事件，恢复储层在关键成藏期的孔隙度可以帮助定量恢复成藏期的地质条件，更好地认识油气成藏的过程。综合利用薄片鉴定、扫描电镜观察、流体包裹体分析、压汞与岩石物性测试等多种技术方法，建立了长岭断陷东岭地区的成岩演化序列，并以"输导层成岩作用演化序列-油气成藏期"时间耦合关系为条件，利用储层孔隙反演回剥的方法恢复了各油气成藏期砂体输导层物性特征，最后结合研究区沉积相展布特征，明确了油气优势运移通道的空间展布范围。研究认为，东岭地区营城组砂体输导层成岩阶段以中成岩A1期为主，砂体输导层具有压实作用主控、油气充注酸性溶蚀作用改善、胶结作用致密化的特点；沙河子组烃源岩两期生烃，伴随两次油气充注，油气进入营城组砂体后，受营城组砂体输导层输导性能影响显著，油气主要沿物性较好且连通性较高的北西向砂体中运移，最终在东部鼻状隆起带中富集。 

Relationship between porosity of Yingcheng sand-body migration channel and hydrocarbon injection of Dongling area,Changling Fault Depression,Songliao Basin

Hydrocarbon accumulation is a geological process. The reconstruction of reservoir porosity in a crucial period of hydrocarbon accumulation can help in quantitatively reconstructing geological conditions of that accumulation. A diagenetic sequence of the Dongling area, Changling Fault Depression was established based on a variety of technologies such as cast thin section interpretation, SEM observation, fluid inclusion analysis, mercury intrusion and petrophysical tests. Based on the timing of the diagenetic sequences of migration channel and the hydrocarbon accumulation period, the physical characteristics of a sand-body migration channel during each hydrocarbon accumulation period were restored by reservoir porosity inversion. Finally, combined with the sedimentary facies of the study area, the spatial distribution range of the advantageous hydrocarbon migration channel was clarified. The sand-body migration channel of the Yingcheng Formation in the study area mainly occurs during the A1 period of medium diagenetic stage. Compaction plays a controlling role, acid dissolution improves porosity, and cementation makes the migration channel more dense. The hydrocarbon source rocks of the Shahezi Formation generated hydrocarbon in two stages, with two hydrocarbon charges. After the oil and gas entered the Yingcheng Formation sand body, the transport performance of the sand body transport layer in the Yingcheng Formation has a significant influence. The oil and gas mainly migrated in the northwest oriented sand body with good physical properties and high connectivity, and finally accumulated in the eastern nose.