Research Institute of Petroleum Exploration and Development

Managing hydraulic fracturing-induced seismicity in the Duvernay shale: Triggering mechanisms, influencing factors, and practice-oriented mitigation strategies

Abstract This review provides a Duvernay-focused synthesis of hydraulic fracturing (HF)-induced seismicity, integrating geological datasets, case studies of significant events, coupled poroelastic simulations, and machine-learning-based factor ranking. While the three underlying...

Deciphering theSource and Formation Mechanism ofImmature Crude Oils in the Paleocene Linhe Formation, Hetao Basin

Abstract The discovered crude oil in the Linhe Formation of the Hetao Basin is a typical immature oil, with proven petroleum geological reserves exceeding 200 million tons, making it one of the most successful cases of low-maturity oil exploration in China in recent years. Howeve...

Diagenesis of UpperTriassic Chang 8 Sandstones, SouthwesternOrdos Basin, China: A New Insight into the Formation Mechanism ofChlorite and Calcite Cement

Abstract Authigenic minerals from Chang 8 sandstones can preserve a precise paleotemperature record. Petrographic observations and geochemical characteristics provide a new insight into the formation mechanism of chlorite and calcite and resolve the problems of mobile elements be...

OVT-Domain Azimuthal Traveltime-Constrained AVO Inversion Method

Azimuthal traveltime analysis provides comparatively stable fracture-orientation estimates but limited information on fracture-related elastic changes, whereas amplitude variation with offset (AVO) inversion is sensitive to residual azimuthal moveout. We propose a sequential offs...

Experimental study on CO2 flooding for enhanced oil recovery in ultra-low permeability reservoirs of the Songliao Basin

<title>Abstract</title> The Daqingzijing Oilfield in the Songliao Basin is characterized by low porosity and ultra-low permeability, exhibiting significant potential for CO ₂ flooding. To further clarify the impact of different CO ₂ injection methods on enha...

Sequential SolventExtraction Reveals Lithofacies-DependentPore Accessibility, Wettability, and Hydrocarbon Partitioning in Organic-RichLacustrine Shales

Abstract Understanding the reservoir characteristics of shale oil formations is an essential workflow in petroleum exploration and development because it supports petroleum-reserve evaluation and guides production activities. Few studies have examined the coupled effects of pore...

Paleozoic Tectonic Transition from Arc–Continent Collision to Post-Orogenic Extension in the East Kunlun Orogen: Constraints from Metamorphic Events

Abstract The tectonic evolution of the trench–arc–back-–arc basin system—encompassing back-arc spreading, subduction, basin closure, and the subsequent transition from arc–continent collision to post-collisional extension—represents a fundamental process in the evolution of the P...

Modeling water flooding effect on well performance in North Troyes oilfield with complex fracture networks

Due to delayed water injection, strong fracture development and insufficient pressure maintenance after long-term depletion, oil production in the North Troyes carbonate reservoir has declined year by year. Moreover, because the reservoir contains low-volatility crude oil and a c...

X‑ray computed tomography‑based experimental investigation of CO₂ miscible zone formation mechanisms and degree of miscibility

Carbon dioxide capture, utilization, and storage–enhanced oil recovery (CCUS–EOR) depends on the progressive development of CO₂–oil miscibility, yet the pressure-controlled transition from interfacial mass transfer to porous-media miscible-zone propagation remains difficult to qu...