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The Study Of Sedimentary Facies And Analysis Of Subtle Reservoir For Taikang--Xichao

Posted on:2006-09-07Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y L LiFull Text:PDF
GTID:1100360152985998Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
By mean of close integrating with the facts of the petroleum exploration of the middle formation combination in Taikang –West Overlap region and through core observation, core microfacies analysis, facies analysis for individual well, sequence stratigraphy interpretation and sedimentary facies analysis, the reservoirs predication, formation—lithological trap identification and so forth have been conducted in the paper, finally have drawn the following important conclusions: 1. Five complete middle-period cycles and one dropping semi-cycle (at the bottom) and one uprising semi-cycle (on the top) have been divided in the middle formation combination of the region. Through the analysis of sequence stratigraphy, two types of sequence stratigrphic models have been established; 2. By mean of the observation, description and analysis of the testing samples, fourteen kinds of core microfacies are classified in the formations of Qingshankou, Yaojia, and Nenjiang No.1 interval of Taikang—West Overlap region. The above types become the primary element of the sedimentary formations in the above area. And furthermore nine typical combined types are formed in vertical; the different combination responds the different sedimentary actions and environments. 3. The fluvial facies, deltaic facies, fan deltaic facies and lake facies sedimentations are well developed in Taikang—West overlap region during the sedimentary periods of Qing 2+ Qing 3 intervals, Yao 1+ Yao 2+ Yao 3 intervals and Nen 1 interval. And furthermore each sedimentary facies can be further subdivided into multiple subfacies and microfacies; 4. The paper regards that the northern, northwestern and southwestern sedimentary systems are separately developed during the sedimentary periods of Gaotaizi oil reservoirs, Putaohua oil reservoirs and Saertu oil reservoirs; the western sedimentary system is well developed during the sedimentary periods of Gaotaizi oil reservoirs and S2 + S3. The above four sedimentary systems control the sand body development and distribution in the region. 5. Considering the match relation of material supply, sedimentary systems distribution and sedimentary facies composition with sedimentary subfacies, the sedimentary infill models are established during low water-level period and water intrusion period of Saertu oil reservoirs; 6. The comprehensive analysis think that the main four formation—lithology trap types are the lithological trap with sand body upward pitchout, the lithological one with sandstone lens, formation lithology one and complex lithological trap; 7. The reservoir types in the studied region are mainly deltaic facies and inshore shallow lake facies sand bodies. The rock types are mainly sandstone and siltstone, the rest is fine conglomerate; 8. The middle petroleum-bearing combination is chiefly controlled by four sedimentary systems. The change of sand body controlled by the different sedimentary system has a certain law; 9. There are three main controlling factors: the first is the petroleum gathering and distribution are controlled by paleohigh and slope region; the second is petroleum enrichment is determined by faults and unconformity; the third is formation—lithological trap is the important trap form of petroleum enrichment in the region; 10. Through the comprehensive studies, 31 formations—lithology traps are predicted in the region. Among them, there are 8 traps in G sand group; 7 in S2+3 sand groups; 10 in S1 sand group; and 6 in S0 sand group.
Keywords/Search Tags:sequence stratigraphy, base-level, accommodation, sedimentary facies, subtle reservoir
PDF Full Text Request
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