关键词: 勘探质效, 溱潼凹陷, 济阳坳陷, 储量估算, 探明地质储量, 页岩层系石油

Abstract:

Shale oil represents a new frontier in both the conceptual revolution and technological breakthroughs for global hydrocarbon exploration while also serving as a new target for sustaining the energy security and maintaining stable hydrocarbon production in China. Shale layers have always been primarily assessed as source rocks previously， leading to a lack of feasible methods and practical bases for estimating their proved oil initially-in-place. To address this， guided by the Specification of Shale Layers Oil Reserves Estimation （DZ/T 0501—2025）， effective since January 2025， SINOPEC has achieved rational control over the oil-bearing area and net pay thickness of shale layers by relying on the optimized deployment of horizontal and vertical wells-directional wells. Besides， the company further leveraged innovative technologies， including two-dimensional nuclear magnetic resonance （2D NMR） analysis of shale cores， to accurately determine key parameters such as shale physical properties and oil-bearing characteristics. Accordingly， a set of scientifically robust and systematic methods for estimating proved oil initially-in-place of shale layers have been developed. Using these technologies， SINOPEC has successfully reported the first batch of 1.8 × 10⁸ t proved oil initially-in-place of shale layers in the Fanyeping 1 block， Jiyang Depression and the Chujialou block of the Qintong Sag. This achievement validated the accuracy and effectiveness of the proposed methods. Building on the proved oil initially in place declaration practice， SINOPEC has gained the following key insights into optimizing shale strata oil exploration and development： strengthening the integrated deployment of exploration and development， acquiring complete and accurate data for reserve assessment， iteratively upgrading reserve assessment methods， and deepening the classification and grading evaluation of oil reserves. These approaches contribute to the elevated quality and efficiency of reserve reporting. Through innovations in the reserve estimation methods and advances in hydrocarbon exploration and development models， SINOPEC has transformed the reporting of proved shale oil originally-in-place from a theoretical concept into a practical reality， providing a replicable technical pathway for the efficient exploration and development of similar oil reservoirs in China.

Key words: quality and efficiency of hydrocarbon exploration, Qintong Sag, Jiyang Depression, reserve estimation, proved oil initially-in-place, shale layers oil