Classification, identification, and reservoir characteristics of intermediate mafic lava flows: a case study in Dongling area, Songliao Basin

Intermediate mafic lava is a special oil and gas reservoir. While its internal structure an important factor affecting the reservoir properties, identification of facies understanding relationship between architecture are limited. This study evaluated intermediate flows Yingcheng Formation in Dongling area Songliao Basin by analyzing drilling cores, corresponding thin sections, scanning electron microscope (SEM) images, as well well-logging seismic attributes. We also performed helium experiments high-pressure mercury intrusion (HPMI) analysis to assess physical properties pore reservoir, respectively. The results showed that develop tabular flow, compound hyaloclastite. Three present diverse responses. was divided into crater-proximal (CF-PF), medial (MF), distal (DF), which were characterized their vesicles joints could be identified through spaces including vesicles, amygdale inner pores, joint fissures, dissolution pores predominantly accumulation. tests reservoir’s quality best CF-PF, main target exploration.