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摘要:
为了寻找巴基斯坦海域油气勘探方向,对收集的大量文献资料进行了整理和分析,并对最新采集的柱状样进行了测试分析,发现巴基斯坦海域烃源岩普遍存在,而储集岩主要为始新统的生物礁和中新统的河道砂岩。巴基斯坦海域北部的马克兰增生楔物源可能主要为细碎屑岩,中新统的河道砂岩分布局限,油气勘探前景差;而在巴基斯坦海域东部的印度扇,中新统河道砂岩分布广,储集性能好。因此,巴基斯坦海域的油气勘探应以东部印度扇为勘探靶区,其主要的勘探层位应以陆架区中新统的河道砂岩和深水区始新统的礁灰岩为主。
Abstract:In order to find out the future direction for oil and gas exploration in the offshore areas of Pakistan, a large amount of literatures was collected and analyzed, and the newly collected columnar samples were tested and analyzed. It was found that source rocks are available in offshore Pakistan and reservoirs are mainly composed of Miocene channel sandstones and Eocene reef limestone. In the northern part of Pakistan Seas, however, the sediments were mainly sourced from the fine-grained clastic rocks of the Makran accretionary wedge, and the Miocene channel-levee complex is limited, and thus the oil and gas exploration prospects are quite poor. However, in the Indus fans off eastern Pakistani, the channel-levee complex is widely distributed as high quality reservoirs. Therefore, it is suggested that the Indus fan in the eastern Pakistan Sea be selected as the target area for future oil and gas exploration taking the Miocene channel sandstone on the continental shelf and the Eocene reef limestone in the deep water as main exploration horizons.
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图 1 巴基斯坦海域大地构造位置(据文献[1])
Figure 1.
图 2 西北印度洋地震层序(据文献[4])
Figure 2.
图 3 巴基斯坦近海钻井位置(据文献[5])
Figure 3.
图 4 马克兰增生楔地层柱状图(据文献[5])
Figure 4.
图 6 过印度扇的地震剖面( 位置见图1)
Figure 6.
表 1 巴基斯坦海域油气钻井结果
Table 1. Oil and gas drillingresultsin Pakistanseas area
序号 井名 公司 年份 深度/m 结果及原因 1 Dabbo Creek-1 Sun 1963 4 354 偏离构造 2 Patiani Creek-1 Sun 1964 2 659 偏离构造 3 Korangi Creek-1 Sun 1964 4 140 缺少盖层 4 Indus Marine 1A Wintshall 1972 2 841 储层差 5 Indus Marine 1B Wintshall 1972 3 804 机械故障 6 Indus Marine 1C Wintshall 1975 1 942 高压地层 7 Karachi South-1 Husky 1978 3 353 储层差 8 Pak Can-1 OGDC 1985 3 702 砂体边缘 9 Sadaf-1 Occidental 1989 3 980 缺少油气充注 10 Shakh Nadin-1 Canterbury 1992 1 679 储层差 11 Pak G2-1 Total 2004 4 700 缺少油气充注 12 Anne-Ax-1 Shell 2007 3 257 未钻遇储层 13 Shark-1 Eni 2010 3 500 缺少油气充注 14 Jalpan-1 Marathon 1976 2 007 地层高压 15 Pasni-1 OPC 1999 3 368 未钻遇储层 16 Gwadar-1 OPC 2000 3 810 未钻遇储层 17 Pasni-2x PPL 2005 4 000 未钻遇储层 -
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