... that the source rock for family 2 is the upper Es4 interval ( Figures 8 , 10 ). The HCA family 3 has three samples. All occur in the Es3 reservoir rock of the Xianhezhuang oil field in the central anticline zone ( Figure 1D ; Table 2 ). Family 3 has a complete series of n-alkanes, showing little sign...

... profile (CC′) of Tuozhuang structure, Shengli oil field. Location of c shown in Figure 1 . The Wangchang oil field in the Qianjiang depression is another example ( Figure 9 ). It is a long, narrow anticline with a typical salt dome. The Oligocene sediments are 1,000 m thick in the flanks...