Preheat oven to 450F.
Place rice in a 9-by-13-inch casserole. In a saucepan, combine chicken broth, whiskey, basil and chervil (or thyme). Bring to a boil and pour over rice. Cover tightly with foil and bake for 30 minutes, or until rice is tender.
Meanwhile, in a Dutch oven, heat oil over medium heat. Add leeks, onion and celery. Cook stirring occasionally, until tender, about 10 minutes.
Add garlic and cook, stirring, for 1 minute more. Add spinach and oysters; cook, stirring, until spinach is just wilted, about 3 minutes. Stir into rice. Season with salt and pepper. (Keep warm, covered, in a 250F oven for up to 1 hour. Or refrigerate for up to 2 days; reheat before serving.)