In global debates about natural resource extraction, affect has played an increasingly prominent, if somewhat nameless, role. This paper proposes a theorization of resource affect both as an intrinsic element of capitalist dynamics and as an object problematized by corporate, government, and third-sector practice. Drawing on ethnographic research in São Tomé and Príncipe (STP), I explore the affective horizons generated by the prospect of hydrocarbon exploration: a doubtful hope comprised of visions of material betterment, personal and collective transformation, as well as anticipations of failure, friction, and discontent. I also examine the multitude of oil-related campaigns, activities, and programmes initiated by non-governmental organizations and global governance institutions in STP, animated by the specific conundrums presented by oil's futurity. In light of this, I argue that what we see emerging is a new resource politics that revolves around not simply the democratic and technical aspects of resource exploitation but increasingly their associated affective dissonances and inconsistencies.How do people sense prospective oil? What do they expect from it? And how does this relate to the indeterminacies that characterize contemporary petroleum production? These questions link conceptions of futurity -that is, imaginations of how we might be and associated ethical orientations towards likely and unlikely things to come -with petroleum source rocks, exploration technologies, and calculations of commercial viability, and with concepts of wealth, labour, and redistribution in extractive economies. Importantly, these questions cast oil not as an abstract commodity form but as entangled in the affective fabric of contemporary economic life. 1 This paper examines how lithospheric dreams 2 of wealth, progress, and modernity emerge alongside anxieties and doubts about uncertain outcomes. In doing so, it also reveals a mounting preoccupation borne out by the accounts and practices of public, corporate, and third-sector agencies with the potential for an excess of affect, specifically, in the context of hydrocarbon exploration.Attention to the affective resonances of natural resources, I argue, has to be part of an effort to comprehend resource environments as simultaneously social, aesthetic, and deeply politicized as well as materially and biophysically grounded (cf. Richardson &