In a medium bowl, whisk together the olive oil, orange juice, lime juice, cilantro, garlic, cumin, oregano, and jalapeño. Season with salt and black pepper to taste. Set aside for about 20 minutes to allow the flavors to meld together. Just before spooning over the pork, whisk the sauce a second time. Leftover sauce can be refrigerated in an airtight container for up to 1 week and used on meats, seafood, poultry, vegetables, and potatoes.