| Liuzhuang oilfield is located at the Puyang county of He Nan province. In regional structure, It is located in the middle of central uplift belt of Dongpu depression.The area of exploration is 120km2.The lower strata of Es2 are terraneous basin sediments. The analytic method of traditional sequence stratigraphy theory is stemmed from sea sediment studies, and how to apply the theory to the exploitation of land sediment. which is an important question for many people paying attention to it. As the result, always very obscured. And the high-resolution sequence stratigraphy from Cross,T.A. ,which is applied in the study area can resolve these problems well. Writer introduces the basic situation of the study area , explains the principles of high-resolution sequence stratigraphy, according to the result of the study, analyse the the sedimentary environment and sedimentary micro-facies. Basied on these works, writer processes the medium-term cycle correlation of the lower strata of Es2 in the area of Liuzhuang, the short-term cycle correlation of the lower strata of Es2 in the block of Liu20, and builds up the frames of high-resolution sequence stratigraphy., analyse the distributing and the continuity of the sandbodies in the medium-term cycle , the distributing and the continuity of the oil and gas in the short-term cycle . This paper referenced many former achievements and materials, and adopted the theories of sequence stratigraphy , referenced the detailed materials of 3-D seismic data and well-logs and well logging date and observed materials of rock core such as the well of Liu20, Liu12. This paper thinks the environment of lower strata of Es2 is the flood-over lake sedimentary, made the one well sediment mode and the whole area sediment model. Based on these works, six types of micro-facies had been identified, including flood channel, bank-barrier, barrier-bank, over-lake bank in the middle of flood channel, overflow bank sand in the edge of flood channel and muddy bank. According to the sections of well logging and the seism, the frames of sequence stratigraphy were builded up, seven-eight medium-cycle were identified and each medium-cycle includes three-four short-cycle. During the course of the short-cycle correlation, This paper assembleds the descending cycle of early cycle and the ascending cycle of late cycle, which are conjointed together , begin to correlate and draw the ichnography . By this method , writer can consider the two connected sandbodies as one unit to analyse , and can contact the sand units of exploitatition in the oilfield. Then analyse the distributing and the continuity of the sandbodies in the medium-cycle, the distributing and the continuity of oil and gas in the short-cycle. The researched result indicates that both the fourth fault and the medium-cycle control the sandbodies, MSS3, MSS4, MSS5 cycle have high sandstone percent, and good reservoir characteristic, the spread of sandbodies on coordinate planes has the trend of directions , bad continuity, mainly develops the sandbodies from the south to north and the sandbodies in the east is more enriched than the sandbodies in the west .The sandbodies mainly enrich in the region which lie in the south from the well of Liu16 to the well of Liu5 and in the north from the well of Liu20 to the well of Liu37,these regions are good targets in the future in the Liuzhuang region. In the block of Liu20, both the fourth fault and the short-cycle control the oil and gas. The enriched degree of oil and gas arranges respectively from high to low is MSC3, MSC4, MSC2, MSC1, MSC5.The materials sources mainly come from the heave of Qiaokou in the east ,others come from the west. |
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