Shows of abundant oil and gas including Bula oilfield and Oseil oilfield have been found in east Seram Island.The oil densities of wells BT-1,EN-1 and BPM-26 are 0.9-0.95 g/cm3,and their sulfur contents are 1.41%-2.69%.Analyses of group composition,carbon isotopic composition and biomarkers of crude oils reveal that the oils came from similar source marine carbonates.The Tertiary-Jurassic Saman-Saman marine marlite is the most likely source rock.Kobisonlah area and Dawang Masiwang area are two biggest oil generating centers.Oil maturity shows that two stages of oil generation and migration happened in this area.The generated oil migrated along thrusts and unconformities.Different thrust blocks had different oil sources.The discovered Oseil low maturity oil came from shallow Saman-Saman carbonates,while the Bula high maturity oil came from deeper Saman-Saman carbonates.The oil resource condition of the Seram Island is favorable.

位于东印尼Seram岛上的Oseil油田是侏罗系Manusela碳酸盐岩裂缝型油藏,油气的分布严格受控于裂缝的展布和发育程度。本文运用频谱分解技术对该区的断裂系统分布和微裂缝的展布规律进行了研究。通过对Manusela层反射特征的分析和裂缝型储层正演模型模拟,总结出碳酸盐岩裂缝型储层的地震响应特征。选择最能反映目标层断层特征的40ms时窗制作了频率调谐体和时频四维体。频率调谐体分析表明,研究区中部和南部发育两组交叉的断裂体系,北部发育一组断裂体系,断层的附近裂缝较为发育,裂缝的展布严格受控于断层的发育。时频四维体从空间上雕刻出了断层和裂缝的分布,裂缝具有表层较发育、深层发育较差的特征,但两者的深层裂缝分布规律比较一致。频谱分解技术预测的结果与钻探结果较为吻合,表明此法有广阔的应用前景。

Sandstone distribution in the third member of Shahejie Formation in Tuo163 well block,Dongying Depression was predicted acca-ording to the sequence stratigraphy theory and logging constrained inversion method.Turbidite fan sedimentary system in lower Es3 and fan-delta sedimentary system in middle and upper Es,were recognized in Tuo163 well block.Many turbid fans developed at eastern and southern parts of the interested region in lower Es3 sedimentation period and the Tuo710 fan is the biggest one among them.Two big fan deltas developed near Tuo717-Tuo718 and Tuo710 well blocks in middle Es3 sedimentation period.Then Jason inversion software of sparse pulse was used to inverse Es3 reservoirs in this area and five sandbodies of Tuo710,Tuo718,Tuo717,Tuo714 and Tuo163 were predicted based on the utilization of three-dimension visualized technique.

Gas hydrate deposited in marine sediment with low temperature and high pressure is a very important marine energy in the future.The exploration and exploitation of gas hydrate is a hotspot in many countries.Besides geophysical methods,geochemical methods are becoming more and more important.Based on domestic and overseas research results,the following methods are summarized in recognizing marine gas hydrate: gas anomalies detection method,liquid geochemical method,stabile isotope geochemical method,acid-degassing method,etc.

The geological background of the Subei basin is that of small relief subsidence, low geothermal gradient, multi-sedimentary hiatuses, intense reconstruction of the basin, frequent magmatic activity, and a unique combination of source rock and reservoir. This geological background resulted in characteristics such as many small fault blocks, multiple oil-bearing formations, scattered oil distribution, mini- to small-sized reservoirs, and difficulties in exploration. Aimed at such characteristics, an effective exploration strategy was adopted, and the oil reserves, production and economic benefits of the Jiangsu oilfield were significantly increased. This exploration strategy included understanding the hydrocarbon generation mechanism of source rocks, progressive evaluation of oil resources, comprehensive research on the faulted systems, the distribution of oil reservoirs and their controlling factors. The techniques used included integration of acquisition, processing and interpretation with 3-D seismics as the core technology, trap description and evaluation, directional drilling and cluster drilling, integration of cuttings logging, gas chromatographic logging and geochemical logging, and integration of early reservoir description and progressive exploration and development. This strategy could be guidance for other complex fault blocks.

Igneous rocks were developed in Funing Formation that is main target of exploration in Sizau area of Hai'an sag, Subei basin. The commercial oil flow was acquired in basal of E1f2 and diabase of E1f3. The igneous distribution in the region is complex and the quality of seismic data is poorer because of igneous influence, which makes accurate identification of igneous rock difficult if only by using seismic data. Through analysis of the feature of seismic sections and logging response of igneous reservoir in studied region, the paper uses gamma and deep lateral resistivity log curves to create pseudo acoustic curves and carries out high-resolution parameters inversion on the basis of taking the inversion of high-resolution wave impedance, gamma pseudo impedance and pseudo impedance of deep lateral resistivity as carriers. On that basis, using Bayes multi-parameter comprehensive identification method to carry out multi-parameter information combination, forming combining data volume and predicting igneous planar and special distribution feature. It is shown by practical data that multi-parameter combining technique can effectively use the results of wave impedance inversion and parameter inversion and more accurately reflect the igneous variation feature.

In Punan area of Daqing oilfield, the total thickness of Putao-hua oil layers is 10~30 m and the individual sand bodies are thin, dispersed, mixed, and transversally variable. Conventional methods can not predict individual sand body precisely. Therefore, the application of high-resolution thin-interbed inversion based on the model in sand body description and reservoir prediction has been studied. Jason inversion method was selected according to the geological features in Putaohua oil layers. By increasing the seismic sampling density, and adopting the log standardization and precise strata calibration, the general resolution of seismic data was increased while the ambiguity of inversion decreased. The initial wave impedance model similar to the real geology condition was established and the final impedance profiles were obtained through Jason inversion. In impedance profiles, thin sand layers are well reflected from the phenomenon of sand bodies becoming thinning and picking out is quite clear, and the distribution of sand bodies is very obvious. The impedance data volume was used to predict the sand thickness and the effective sand thickness, showing a good accordance with the drilling results.

Igneous rocks are very developed in the main exploration object layers of Funing Formation in Sizao region,Haian Sag,Subei Basin.However the distribution of the igneous rocks is complex,the quality of seismic data is worse.The igneous rock,its metamorphic zone and clastic rock cann't be apparently reflected on acoustic slowness logging curve,and therefore it is difficult to predict the igneous reservoirs.In accordance with the characters of the studied area,some logging curves can be selected through statistic analysis of the logging curves of several wells in the area and reconstructed on which the igneous rock and clastic rock can be effectively distinguished.The fitting degree between the pseudo-impedance model established based on the reconstructed logging curves and real geological regulation is higher than that between the model established based on original logging curves and real geological regulation.Distribution character of igneous rock described by GR inversion fitted together with real geological analyses and recognition fairly good too.Those indicated that log rebuilding technique affected positively and availably in the inversion of igneous rock.On base of this inversion result,Synthetical description of igneous reservoir was done combining with geological recognition and real drilling and logging data of target area.Eight traps controlled by igneous rock were described and six new traps were predicted.This study provided reliable reference material in next step exploration of this area.