Question: what is upstream project in oil and gas
[{'answer': 'drilling exploratory wells', 'provenance': [{'wikipedia_id': '2152848', 'title': 'Upstream (petroleum industry)', 'start_paragraph_id': 1, 'start_character': 258, 'end_paragraph_id': 1, 'end_character': 284, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'searching for potential underground or underwater crude oil and natural gas fields'}, {'answer': 'searching for potential underground or underwater crude oil and natural gas fields , drilling exploratory wells , and subsequently drilling and operating the wells that recover and bring the crude oil or raw natural gas to the surface'}, {'answer': 'drilling and operating the wells that recover and bring the crude oil or raw natural gas to the surface'}, {'provenance': [{'wikipedia_id': '2152848', 'title': 'Upstream (petroleum industry)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 406, 'bleu_score': 0.664738951153463, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4323380545079318290}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2152848', 'title': 'Upstream (petroleum industry)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The oil and gas industry is usually divided into three major sectors: upstream (or exploration and production- E&P")", midstream and downstream. The upstream sector includes searching for potential underground or underwater crude oil and natural gas fields, drilling exploratory wells, and subsequently drilling and operating the wells that recover and bring the crude oil or raw natural gas to the surface', 'The upstream sector includes searching for potential underground or underwater crude oil and natural gas fields, drilling exploratory wells, and subsequently drilling and operating the wells that recover and bring the crude oil or raw natural gas to the surface.', 'The oil and gas industry is usually divided into three major sectors: upstream (or exploration and production- E&P")", midstream and downstream. The upstream sector includes searching for potential underground or underwater crude oil and natural gas fields, drilling exploratory wells, and subsequently drilling and operating the wells that recover and bring the crude oil or raw natural gas to the surface.\rhighlight sentence(s) containing evidence, not only the answer']}}]}]