Texas Tribune | BP Reports Surprise Production Jump At Mature Fields OilPrice.com Norwegian oil companies and Shell have also reported better production results from their mature fields. While for the companies operating these fields should pat themselves on the back, it is a new problem for OPEC, which is currently focusing on U.S ... At Houston energy conference, Texas is the focus of American oil optimism as the last bust fades Oil optimism is the real deal Tight oil's surge poses a familiar dilemma for Opec |